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

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

Change-Id: Icbe810560520eef54614f630647eaa5fd9d59e2b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>