Fix playerviewcontroller keypath leak of observers #1827
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Bug fix for autorotation and dismissal from
Provide an example of how to test the change
Dismissal of fullscreen player on iOS 10.3.1 was resulting in a fatal crash because keypath observers had not yet been removed from _playerViewController
Describe the changes
Add try catch block to remove keypath observers in the dismissal of the playerviewController. Fixes crash from exiting fullscreen.