[ Widget Preview ] Throw ToolExit if Flutter Web is not enabled
#178500
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If Flutter Web is not enabled, the widget previewer will crash when trying to find a web device to launch with. This change explicitly checks for this case and throws `ToolExit` with instructions to enable Flutter Web if it's not enabled. Fixes #178486
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This pull request adds a check to the widget preview command to ensure that Flutter Web is enabled. If it is not, the command now exits with a helpful error message instructing the user on how to enable it. This prevents a crash that would otherwise occur when no web devices can be found. The change also includes a new test case to verify this behavior. The implementation is correct and improves the user experience for the widget preview feature.
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…utter#178500) If Flutter Web is not enabled, the widget previewer will crash when trying to find a web device to launch with. This change explicitly checks for this case and throws `ToolExit` with instructions to enable Flutter Web if it's not enabled. Fixes flutter#178486
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…utter#178500) If Flutter Web is not enabled, the widget previewer will crash when trying to find a web device to launch with. This change explicitly checks for this case and throws `ToolExit` with instructions to enable Flutter Web if it's not enabled. Fixes flutter#178486
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…utter#178500) If Flutter Web is not enabled, the widget previewer will crash when trying to find a web device to launch with. This change explicitly checks for this case and throws `ToolExit` with instructions to enable Flutter Web if it's not enabled. Fixes flutter#178486
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…utter#178500) If Flutter Web is not enabled, the widget previewer will crash when trying to find a web device to launch with. This change explicitly checks for this case and throws `ToolExit` with instructions to enable Flutter Web if it's not enabled. Fixes flutter#178486
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…utter#178500) If Flutter Web is not enabled, the widget previewer will crash when trying to find a web device to launch with. This change explicitly checks for this case and throws `ToolExit` with instructions to enable Flutter Web if it's not enabled. Fixes flutter#178486
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If Flutter Web is not enabled, the widget previewer will crash when trying to find a web device to launch with. This change explicitly checks for this case and throws
ToolExitwith instructions to enable Flutter Web if it's not enabled.Fixes #178486