am 13af5b3f: Fixes null pointer bug for conference call.

* commit '13af5b3f274519a65fac1e83b00df906b171c16e':
  Fixes null pointer bug for conference call.
tree: 5e1b092a8c0b3619d4a84f9f85afba9f63ee1b83
  1. InCallUI/