Merge "Add null check when settling on LAST_TASK" into sc-v2-dev am: d48fbecd1a am: e62cedb2ec

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/16150962

Change-Id: Ib0abf89969298e56bcc19800a72000b8ca708a04