Fix a no-thumbnail error message.

This happens if we cancel the first image reqest and then resend another
in a very short time. We may got an null image for the first request and
think this is a invalid bitmap.

Change-Id: I9ab62a658c281ef3d197474a5db50579e560f1bd
1 file changed
tree: c41495dd87b6009147b3209ea50e2aa7bbf20b99
  1. gallerycommon/
  2. src/
  3. src_pd/
  4. tests/