Do not fail skimage on missing expectations.

This will allow adding new images to test without turning the bots
red.

R=epoger@google.com

Review URL: https://codereview.chromium.org/22301006

git-svn-id: http://skia.googlecode.com/svn/trunk@10578 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed