Merge "Ignore null action in NotificationAttentionHelper." into main am: c4c0175eaa am: fc905d6ce0

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3324494

Change-Id: I72bb57254beb425232d8322053eeea3d26565bba
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>