[automerger skipped] Fix npe in onStart() am: ad728ecd5d -s ours

am skip reason: Merged-In I7a6e7387e5e8712f93e1c8df19e8741c541a1b2f with SHA-1 fccca46117 is already in history

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/27722744

Change-Id: I15ba8e57b1eb2898014ec5b26231925b561ba113
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>