Merge "Nullify taskbar hotseatView tag when the cell is empty" into sc-dev am: 5e88032461

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/13787772

MUST ONLY BE SUBMITTED BY AUTOMERGER

Change-Id: I5d38eb855c7632da776f86aeaa06efb64bae7f44