Merge "Properly handle onNullBinding() in appwidget service." into sc-dev am: 30f9963e89 am: 9055385749 am: 95ebd3170a

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/29073151

Change-Id: I9edc3e9a6bea83f9559bae2113fa144d7eb4ab9b
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>