Merge "Fix crash from previewing launcher with unknown wallpaper colors." into sc-dev am: 200d7634 am: 36af576d

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/Launcher3/+/15462873

Change-Id: I1dca7718954974c49391bc0c9b6cb9be79e94a6e