Don't try to revoke to roles that don't exist
Don't try to revoke to roles that don't exist

splashblot/dronedb,bloomberg/cartodb,bloomberg/cartodb,dbirchak/cartodb,DigitalCoder/cartodb,codeandtheory/cartodb,dbirchak/cartodb,nuxcode/cartodb,bloomberg/cartodb,UCL-ShippingGroup/cartodb-1,thorncp/cartodb,thorncp/cartodb,splashblot/dronedb,codeandtheory/cartodb,dbirchak/cartodb,codeandtheory/cartodb,UCL-ShippingGroup/cartodb-1,thorncp/cartodb,nuxcode/cartodb,CartoDB/cartodb,dbirchak/cartodb,CartoDB/cartodb,nyimbi/cartodb,nuxcode/cartodb,nyimbi/cartodb,future-analytics/cartodb,nyimbi/cartodb,DigitalCoder/cartodb,DigitalCoder/cartodb,nuxcode/cartodb,thorncp/cartodb,splashblot/dronedb,DigitalCoder/cartodb,bloomberg/cartodb,nuxcode/cartodb,nyimbi/cartodb,CartoDB/cartodb,CartoDB/cartodb,future-analytics/cartodb,codeandtheory/cartodb,splashblot/dronedb,codeandtheory/cartodb,UCL-ShippingGroup/cartodb-1,DigitalCoder/cartodb,future-analytics/cartodb,CartoDB/cartodb,thorncp/cartodb,future-analytics/cartodb,splashblot/dronedb,bloomberg/cartodb,UCL-ShippingGroup/cartodb-1,future-analytics/cartodb,nyimbi/cartodb,dbirchak/cartodb,UCL-ShippingGroup/cartodb-1