Handle errors for disposed CameraController and async disposal.#234
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Use await for controller disposal so catch reliably handles errors.
frankmer
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Error: CameraException(Disposed CameraController, buildPreview() was called on a disposed CameraController.)
Fix: Catch disposed CameraController in build to prevent CameraException.
Error: CameraException(Uninitialized CameraController, stopImageStream() was called on an uninitialized CameraController.)
Fix: Use await for controller disposal so catch reliably handles errors.