Continue to the next iteration of the loop if an instance is not found.
Continue to the next iteration of the loop if an instance is not found.

Change-Id: I0342bfd9ec04c2bec25d03ce1200d38a57929bb9

hyakuhei/cleantox,zancas/hacking,emonty/oslo-hacking,zancas/hacking,emonty/oslo-hacking,hyakuhei/cleantox,openstack-dev/hacking,openstack-dev/hacking