am c51d49f0: Merge "Null protect maybeShowConferenceCallButton." into lmp-dev

* commit 'c51d49f06bf5b7a0284f6daa6d58f068a8f37add':
  Null protect maybeShowConferenceCallButton.
tree: d2b1b86c4afaf2b5f6d54b414ca7b18fc760c83a
  1. InCallUI/