Merge "Early exit if the target region is empty" into sc-dev am: 47d7cbaf am: 160827fb am: 6dbd0d16

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

Change-Id: I5aca584aa133a262eef92af62fd4a50655d549ce