[automerger] DO NOT MERGE Add null check to EmergencyCallbackModeExitDialog activity. am: 78fab1f98d am: 06c169f3db am: 04676b86b4 skipped: c20ea0938b am: a91ef0b14b am: 47ff9a1f65 am: d3ce7249ce am: 6893327c60

Change-Id: I71aa79311ee7e1bd4f4efc92515713fd37cf2667