Merge "Fix potential NPE crash in ConversationHeaderPreferenceController" am: 4378ee11ad am: 1f9c4c483a am: 693ce48efb am: 2d1b325cd0

Original change: https://android-review.googlesource.com/c/platform/packages/apps/Settings/+/2210776

Change-Id: I8fc0d30dd8338152ce2e9c7dc7741b9543f6dcf3
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>