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: I9bf2ce4802ca9617b1e18447d14796f97245f2a2