Merge "Fix NPE inside REcyclerViewFastScroller" into sc-dev am: 8c0f8fba9c am: d4f7c9a666 am: 3be86e5920

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14966513

Change-Id: I8bf24bf1e5c8ea1c209855f55e400c56c61bb691