Fixed bug: UA can be nil
Fixed bug: UA can be nil

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