Ensure reviewer total is always set
Ensure reviewer total is always set

Change-Id: I76a88b52b6a55212a29348c3cef23ce4511c8142

JohnGarbutt/reviewstats,openstack-infra/reviewstats,cp16net/reviewstats,cp16net/reviewstats,JohnGarbutt/reviewstats,openstack-infra/reviewstats