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

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

Change-Id: I10f9305958fe5ecb9d95b2647d1a86547167f891