Prevent NPE by return empty list am: bb338d7a96

Original change: https://googleplex-android-review.googlesource.com/c/platform/frameworks/base/+/26927268

Change-Id: Ia6c993592d72fadc7032219d5f1c4330d51b1660
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>