Merge "Prevent launcher crash when an App Widget is removed." into sc-dev am: 8c3f8d3f71

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/14063486

Change-Id: Ia809f793ccc156aaa58a1c1b73aa1b8c9a76e83a