Special case when the change description has no footers, but looks
like a footer.

R=machenbach@chromium.org,andybons@chromium.org
BUG=579176

Review URL: https://codereview.chromium.org/1812803002

git-svn-id: svn://svn.chromium.org/chrome/trunk/tools/depot_tools@299343 0039d316-1c4b-4281-b951-d872f2087c98