Added check for None missed in recent commit.
Added check for None missed in recent commit.

Reported by fta At sofaraway.org

BUG=None
TEST=None
TBR=evan@chromium.org

Review URL: http://codereview.chromium.org/6610013

git-svn-id: http://src.chromium.org/svn/trunk/src@76733 4ff67af0-8c30-449e-8e8b-ad334ec8d88c

Former-commit-id: 96cabc3679da8600eef3be63b39923e1e2ebb603
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