Fix allowing empty default_quota_in_bytes
Fix allowing empty default_quota_in_bytes

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