In GetResourceAsBitmap, don't crash if the resource is missing

NewFromEncoded returns nullptr if the resourceData is null or empty.

BUG=skia:

Change-Id: I8812b92b8664ebf5e5cf5cdd8b3bfb29963ed454
Reviewed-on: https://skia-review.googlesource.com/5314
Reviewed-by: Matt Sarett <msarett@google.com>
Commit-Queue: Brian Osman <brianosman@google.com>
1 file changed