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

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

Change-Id: Id0716a09233e3514388f0ed73a4bd60d376aee2d
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>