Fix FontMgrTest to allow for unnamed fonts.

Motivation: we are testing on a system without fonts and are falling
back on SkTypeface_Empty.

R=bungeman@google.com

Author: halcanary@google.com

Review URL: https://codereview.chromium.org/187933002

git-svn-id: http://skia.googlecode.com/svn/trunk@13675 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed