am 5a812d4e: am fe79d62d: Merge "Adding additional null checks to prevent crash after task stack view callback is reset. (Bug 18376798)" into lmp-mr1-dev

* commit '5a812d4e6986e71121b6f8374e51b3ea5ef076ae':
  Adding additional null checks to prevent crash after task stack view callback is reset. (Bug 18376798)