django 1.7: allow the commands syncdb and migrate to be run a second time
django 1.7: allow the commands syncdb and migrate to be run a second time

pretix/cleanerversion,anfema/cleanerversion,swisscom/cleanerversion,swisscom/cleanerversion,pretix/cleanerversion,pretix/cleanerversion,anfema/cleanerversion,anfema/cleanerversion,swisscom/cleanerversion