[automerger] DO NOT MERGE Add null check to EmergencyCallbackModeExitDialog activity. am: 78fab1f98d am: 06c169f3db am: 04676b86b4 skipped: c20ea0938b am: a91ef0b14b am: 47ff9a1f65 am: d3ce7249ce

Change-Id: I6b536a0062b621c64d26d8d0bcd411b4fd31cf9a