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Fixed potential crash in BFAppLinkReturnToRefererController when it is initialized without navigation controller.

Merged Administrator requested to merge applinks_return_fix into master

Created by: ghost

Looks like we are removing NSNotificationCenter observation, only in case when there was the controller was initialized with navigation controller - whilst this is not the only way you can initialize the BFAppLinkReturnToRefererController.

  • Observe status bar and device orientation only when attached to the navigation controller
  • Remove observe more efficiently (the removeObserver:name:object: is slower than just removeObserver:, as it performs unnecessary lookups)