Merge "Fix null pointer risk on shouldSleepActivities." into main am: 30c3601a1a am: e35c3f4a79 am: 44e0f1b824

Original change: https://android-review.googlesource.com/c/platform/frameworks/base/+/2842897

Change-Id: I6c5d31f64554a5efdc171472e768e044032210de
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>