Handle errors gracefully in WallpaperCropActivity.

(cherry picked from commit c984cde00840d8594a8b203748cb6e4f9967fd7c)
Now instead of crashing, it says "Couldn't load image."

Bug: 25326319
Bug: 25656670
Change-Id: I71471f4b26f7c23dee40b60772ddd798f67b409e
1 file changed