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: 160827fb am: 6dbd0d16 am: 1d7ad406

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

Change-Id: I235547dbcde1fa468e929f903b94ea1b5954e7c6