Merge "Early exit if the target region is empty" into sc-dev am: 47d7cbaf...

Merge "Early exit if the target region is empty" into sc-dev am: 47d7cbaf am: ddda404a am: ed447b38 am: 8839a14f

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/15391846

Change-Id: Ia4e21ef6bc6d5c1e5113e9704d3cb0d8790a3e06