[camera_android_camerax] Fixes crash with unsupported operation exception

[Mairramer]

Fixes crash in DeviceOrientationManager caused by UnsupportedOperationException when getDisplay() is called on a null or destroyed Activity during rotation.

Fixesflutter/flutter#176613

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[camsim99]

The change looks good to me overall. Thanks for the quick fix! But I do want to discuss the check added to getDisplay.

[camsim99]

LGTM :) thanks!

[bparrishMines]

LGTM

[auto-submit]

autosubmit label was removed for flutter/packages/10342, because - The status or check suite Linux_android android_device_tests_shard_1 master has failed. Please fix the issues identified (or deflake) before re-applying this label.

• The status or check suite Linux_android android_build_all_packages stable has failed. Please fix the issues identified (or deflake) before re-applying this label.
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