Merge "Only update the compat system UI visibility if the source is valid"...

Merge "Only update the compat system UI visibility if the source is valid" into tm-dev am: 1fab4540 am: 1a2b3de8

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/18583184



Change-Id: Iacbf6be2ba274e4542a09ba6f882dde9f1bdb15c
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>