Fix try job status PRESUBMIT check when an issue is private.
Fix try job status PRESUBMIT check when an issue is private.

TEST=presubmit doesn't throw an exception on private issues
BUG=none
Review URL: http://codereview.chromium.org/207030

git-svn-id: http://src.chromium.org/svn/trunk/src@26598 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: fd6ab3b4a412483249c677a479825bc7164e2699
meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser,meego-tablet-ux/meego-app-browser