Handles onFailure case of getting wallpaper color am: 90f902c40b am: 3a5c3369f9

Original change: https://googleplex-android-review.googlesource.com/c/platform/packages/apps/WallpaperPicker2/+/11699848

Change-Id: I284763f5d7c1d13a156b40005df2d76fa51d2e64