[ Widget Preview ] Crashes when flutter config --no-enable-web is set #178486
Description
If a user has set flutter config --no-enable-web, the widget previewer will crash on launch with one of the two following errors:
flutter widget-preview start:
Error: Failed to locate browser. Make sure you are using an up-to-date Chrome or Edge. Otherwise, consider running with --web-server instead.
flutter widget-preview start --web-server:
StateError: Bad state: No element
#0 List.single (dart:core-patch/growable_array.dart:362:22)
#1 WidgetPreviewStartCommand.runPreviewEnvironment (package:flutter_tools/src/commands/widget_preview.dart:404:26)
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#2 WidgetPreviewStartCommand.runCommand (package:flutter_tools/src/commands/widget_preview.dart:344:24)
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#3 FlutterCommand.run.<anonymous closure> (package:flutter_tools/src/runner/flutter_command.dart:1559:27)
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#4 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
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#5 CommandRunner.runCommand (package:args/command_runner.dart:212:13)
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#6 FlutterCommandRunner.runCommand.<anonymous closure> (package:flutter_tools/src/runner/flutter_command_runner.dart:487:9)
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#7 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
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#8 FlutterCommandRunner.runCommand (package:flutter_tools/src/runner/flutter_command_runner.dart:422:5)
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#9 run.<anonymous closure>.<anonymous closure> (package:flutter_tools/runner.dart:101:11)
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#10 AppContext.run.<anonymous closure> (package:flutter_tools/src/base/context.dart:154:19)
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#11 main (package:flutter_tools/executable.dart:103:3)
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