fix regression bug in visualization validation
fix regression bug in visualization validation

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