Merge "Ignore null action in WebViewUpdateService." into main am: 749f16456c am: ddd102153c

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/3327734

Change-Id: I648122a7389ffc33bf36fbd07373dfb7d3736ccc
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>