fix div by zero in dash
fix div by zero in dash

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