[automerger] DO NOT MERGE Add null check to EmergencyCallbackModeExitDialog activity. am: 78fab1f98d am: 06c169f3db am: 04676b86b4 skipped: c20ea0938b am: a91ef0b14b am: 47ff9a1f65

Change-Id: I7bd6b8e91e79228c26439dd4f4b939e9fe48bc0b