fix github support

after the method extraction, I missed one change. We aren't in a
loop any more, so continue isn't valid in this context. Instead
the function should just return to short circuit the rest of the
execution.

Change-Id: Ia52374da14c6ef4f5495adc1b3e2591ea9f58c85
Reviewed-on: https://review.openstack.org/28230
Reviewed-by: Jeremy Stanley <fungi@yuggoth.org>
Approved: Monty Taylor <mordred@inaugust.com>
Reviewed-by: Monty Taylor <mordred@inaugust.com>
Tested-by: Jenkins