Merge "Check null for top activity when updating orientation" into tm-qpr-dev am: fc18585969

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/21218459

Change-Id: I3b56427fb7440bece3679af07cbe8a517893d5dd
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>