Merge "Fix crash from previewing launcher with unknown wallpaper colors." into sc-dev am: 200d7634d1 am: c2a6378fc1

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

Change-Id: Ia7d17abd9526c2fc8dab7edb34f85dc89e342c66