[misc] Prevent migrators from running on a clean database
[misc] Prevent migrators from running on a clean database

itaiGershtansky/phenotips,tmarathe/phenotips,DeanWay/phenotips,DeanWay/phenotips,phenotips/phenotips,mjshepherd/phenotips,veronikaslc/phenotips,alexhenrie/phenotips,phenotips/phenotips,phenotips/phenotips,teyden/phenotips,JKereliuk/phenotips,veronikaslc/phenotips,phenotips/phenotips,danielpgross/phenotips,tmarathe/phenotips,danielpgross/phenotips,mjshepherd/phenotips,veronikaslc/phenotips,JKereliuk/phenotips,DeanWay/phenotips,teyden/phenotips,itaiGershtansky/phenotips,itaiGershtansky/phenotips,danielpgross/phenotips,phenotips/phenotips,teyden/phenotips,alexhenrie/phenotips,mjshepherd/phenotips,alexhenrie/phenotips,tmarathe/phenotips,JKereliuk/phenotips,teyden/phenotips,teyden/phenotips