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: 7bb53866 am: d088477a

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

Change-Id: I96b706f3149085c21be4d43a8678ff82b9809257