`BottomAppBar` doesn't work when set `floatingActionButtonAnimator` to `FloatingActionButtonAnimator.noAnimation`

### Steps to reproduce

1. Run the sample code

### Expected results

BottomAppBar should be visible on the screen

### Actual results

BottomAppBar is not rendered on the screen and throws exceptions

### Code sample

<details open><summary>Code sample</summary>

```dart
class MyHomePage extends StatelessWidget {
  const MyHomePage({super.key, required this.title});

  final String title;

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: Text(title)),
      body: SizedBox(),
      bottomNavigationBar: BottomAppBar(),
      floatingActionButton: FloatingActionButton(onPressed: () {}),
      floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
      floatingActionButtonAnimator: FloatingActionButtonAnimator.noAnimation,
    );
  }
}
```

</details>


### Screenshots or Video

<details open>
<summary>Screenshots / Video demonstration</summary>

`floatingActionButtonAnimator: FloatingActionButtonAnimator.scaling` (This is result is also expected for `noAnimation`):

<img width="270" height="570" alt="Image" src="https://github.com/user-attachments/assets/f61ac518-066e-4b5f-aa44-323d3c141137" />

`floatingActionButtonAnimator: FloatingActionButtonAnimator.noAnimation`:

<img width="270" height="570" alt="Image" src="https://github.com/user-attachments/assets/6f910213-8a27-4305-b4d9-3732058338ca" />

</details>


### Logs

<details open><summary>Logs</summary>

```console
======== Exception caught by rendering library =====================================================
The following _TypeError was thrown during paint():
Null check operator used on a null value

The relevant error-causing widget was: 
  BottomAppBar BottomAppBar:file:///Users/saman/AndroidStudioProjects/bug/lib/main.dart:48:28
When the exception was thrown, this was the stack: 
#0      _ScaffoldGeometryNotifier.value (package:flutter/src/material/scaffold.dart:889:73)
#1      _BottomAppBarClipper.getClip (package:flutter/src/material/bottom_app_bar.dart:279:35)
#2      _RenderCustomClip._updateClip (package:flutter/src/rendering/proxy_box.dart:1490:25)
#3      RenderPhysicalShape.paint (package:flutter/src/rendering/proxy_box.dart:2255:5)
#4      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3427:7)
#5      PaintingContext.paintChild (package:flutter/src/rendering/object.dart:261:13)
#6      RenderBoxContainerDefaultsMixin.defaultPaint (package:flutter/src/rendering/box.dart:3372:15)
#7      RenderCustomMultiChildLayoutBox.paint (package:flutter/src/rendering/custom_layout.dart:424:5)
#8      RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3427:7)
#9      PaintingContext.paintChild (package:flutter/src/rendering/object.dart:261:13)
#10     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:13)
#11     _RenderInkFeatures.paint (package:flutter/src/material/material.dart:632:11)
#12     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3427:7)
#13     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:261:13)
#14     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:13)
#15     RenderPhysicalModel.paint.<anonymous closure> (package:flutter/src/rendering/proxy_box.dart:2190:15)
#16     PaintingContext.pushClipRRect (package:flutter/src/rendering/object.dart:611:14)
#17     RenderPhysicalModel.paint (package:flutter/src/rendering/proxy_box.dart:2177:21)
#18     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3427:7)
#19     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:261:13)
#20     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:13)
#21     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3427:7)
#22     PaintingContext.paintChild (package:flutter/src/rendering/object.dart:261:13)
#23     RenderProxyBoxMixin.paint (package:flutter/src/rendering/proxy_box.dart:140:13)
#24     RenderObject._paintWithContext (package:flutter/src/rendering/object.dart:3427:7)
#25     PaintingContext._repaintCompositedChild (package:flutter/src/rendering/object.dart:176:11)
#26     PaintingContext.repaintCompositedChild (package:flutter/src/rendering/object.dart:121:5)
#27     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1312:31)
#28     PipelineOwner.flushPaint (package:flutter/src/rendering/object.dart:1322:15)
#29     RendererBinding.drawFrame (package:flutter/src/rendering/binding.dart:631:23)
#30     WidgetsBinding.drawFrame (package:flutter/src/widgets/binding.dart:1242:13)
#31     RendererBinding._handlePersistentFrameCallback (package:flutter/src/rendering/binding.dart:495:5)
#32     SchedulerBinding._invokeFrameCallback (package:flutter/src/scheduler/binding.dart:1438:15)
#33     SchedulerBinding.handleDrawFrame (package:flutter/src/scheduler/binding.dart:1351:9)
#34     SchedulerBinding.scheduleWarmUpFrame.<anonymous closure> (package:flutter/src/scheduler/binding.dart:1060:9)
#35     PlatformDispatcher.scheduleWarmUpFrame.<anonymous closure> (dart:ui/platform_dispatcher.dart:889:16)
#39     _RawReceivePort._handleMessage (dart:isolate-patch/isolate_patch.dart:193:12)
(elided 3 frames from class _Timer and dart:async-patch)
The following RenderObject was being processed when the exception was fired: RenderPhysicalShape#f9ce7 relayoutBoundary=up1
...  parentData: offset=Offset(0.0, 701.1); id=_ScaffoldSlot.bottomNavigationBar (can use size)
...  constraints: BoxConstraints(w=392.7, 0.0<=h<=781.1)
...  size: Size(392.7, 80.0)
...  elevation: 3.0
...  color: Color(alpha: 1.0000, red: 0.9490, green: 0.9255, blue: 0.9569, colorSpace: ColorSpace.sRGB)
...  shadowColor: Color(alpha: 1.0000, red: 0.9490, green: 0.9255, blue: 0.9569, colorSpace: ColorSpace.sRGB)
...  clipper: _BottomAppBarClipper
RenderObject: RenderPhysicalShape#f9ce7 relayoutBoundary=up1
  parentData: offset=Offset(0.0, 701.1); id=_ScaffoldSlot.bottomNavigationBar (can use size)
  constraints: BoxConstraints(w=392.7, 0.0<=h<=781.1)
  size: Size(392.7, 80.0)
  elevation: 3.0
  color: Color(alpha: 1.0000, red: 0.9490, green: 0.9255, blue: 0.9569, colorSpace: ColorSpace.sRGB)
  shadowColor: Color(alpha: 1.0000, red: 0.9490, green: 0.9255, blue: 0.9569, colorSpace: ColorSpace.sRGB)
  clipper: _BottomAppBarClipper
...  child: RenderClipPath#b10bf relayoutBoundary=up2 NEEDS-PAINT
...    parentData: <none> (can use size)
...    constraints: BoxConstraints(w=392.7, 0.0<=h<=781.1)
...    size: Size(392.7, 80.0)
...    child: RenderCustomPaint#d47ab relayoutBoundary=up3 NEEDS-PAINT
...      parentData: <none> (can use size)
...      constraints: BoxConstraints(w=392.7, 0.0<=h<=781.1)
...      size: Size(392.7, 80.0)
...      painter: null
...      foregroundPainter: _ShapeBorderPainter#a78ea()
...      child: _RenderInkFeatures#7289c relayoutBoundary=up4 NEEDS-PAINT
...        parentData: <none> (can use size)
...        constraints: BoxConstraints(w=392.7, 0.0<=h<=781.1)
...        size: Size(392.7, 80.0)
...        child: RenderPadding#64f8a relayoutBoundary=up5 NEEDS-PAINT
...          parentData: <none> (can use size)
...          constraints: BoxConstraints(w=392.7, 0.0<=h<=781.1)
...          size: Size(392.7, 80.0)
...          padding: EdgeInsets.zero
...          textDirection: ltr
====================================================================================================
```

</details>


### Flutter Doctor output

<details open><summary>Doctor output</summary>

```console
[✓] Flutter (Channel stable, 3.32.8, on macOS 15.5 24F74 darwin-arm64, locale en-US) [3.8s]
    • Flutter version 3.32.8 on channel stable at /Users/saman/development/flutter
    • Upstream repository https://github.com/flutter/flutter.git
    • Framework revision edada7c56e (3 days ago), 2025-07-25 14:08:03 +0000
    • Engine revision ef0cd00091
    • Dart version 3.8.1
    • DevTools version 2.45.1

[✓] Android toolchain - develop for Android devices (Android SDK version 35.0.0) [15.9s]
    • Android SDK at /Users/saman/Library/Android/sdk
    • Platform android-35, build-tools 35.0.0
    • ANDROID_HOME = /Users/saman/Library/Android/sdk
    • Java binary at: /Applications/Android Studio.app/Contents/jbr/Contents/Home/bin/java
      This is the JDK bundled with the latest Android Studio installation on this machine.
      To manually set the JDK path, use: `flutter config --jdk-dir="path/to/jdk"`.
    • Java version OpenJDK Runtime Environment (build 21.0.5+-13047016-b750.29)
    • All Android licenses accepted.

[✓] Xcode - develop for iOS and macOS (Xcode 16.2) [4.7s]
    • Xcode at /Users/saman/Downloads/Xcode.app/Contents/Developer
    • Build 16C5032a
    • CocoaPods version 1.16.2

[✓] Chrome - develop for the web [12ms]
    • Chrome at /Applications/Google Chrome.app/Contents/MacOS/Google Chrome

[✓] Android Studio (version 2024.3) [11ms]
    • Android Studio at /Applications/Android Studio.app/Contents
    • Flutter plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/9212-flutter
    • Dart plugin can be installed from:
      🔨 https://plugins.jetbrains.com/plugin/6351-dart
    • Java version OpenJDK Runtime Environment (build 21.0.5+-13047016-b750.29)

[✓] VS Code (version 1.102.1) [9ms]
    • VS Code at /Applications/Visual Studio Code.app/Contents
    • Flutter extension can be installed from:
      🔨 https://marketplace.visualstudio.com/items?itemName=Dart-Code.flutter

[✓] Connected device (3 available) [6.7s]
    • sdk gphone64 arm64 (mobile) • emulator-5554 • android-arm64  • Android 12 (API 31) (emulator)
    • macOS (desktop)             • macos         • darwin-arm64   • macOS 15.5 24F74 darwin-arm64
    • Chrome (web)                • chrome        • web-javascript • Google Chrome 138.0.7204.169

[✓] Network resources [1,215ms]
    • All expected network resources are available.

• No issues found!

```

</details>


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`BottomAppBar` doesn't work when set `floatingActionButtonAnimator` to `FloatingActionButtonAnimator.noAnimation` #172866

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BottomAppBar doesn't work when set floatingActionButtonAnimator to FloatingActionButtonAnimator.noAnimation #172866

Description

Steps to reproduce

Expected results

Actual results

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Logs

Flutter Doctor output

Metadata

Metadata

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Labels

Type

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Issue actions

`BottomAppBar` doesn't work when set `floatingActionButtonAnimator` to `FloatingActionButtonAnimator.noAnimation` #172866