Merge "Properly handle onNullBinding() in appwidget service." into sc-dev am: 30f9963e89 am: 9055385749 am: 95ebd3170a am: 3cbbff62e5

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

Change-Id: Ib74d87c93181ffc1fbab9c8540c7191000b24d04
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>