Merge "Null check on BroadcastRecord's receivers list." into tm-dev am: f3e8d882

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/17590974



Change-Id: Ib4c9e65b55a5eeeb164552d21ad9baec579c8c41
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>