Merge "Fix NPE of FolderPagedView#setFocusOnFirstChild" into udc-dev am: 0d07a85299 am: 63144d9a29

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/23254588

Change-Id: I6f203417d5699fc57149dcc81ce465594fca4782
Signed-off-by: Automerger Merge Worker <android-build-automerger-merge-worker@system.gserviceaccount.com>