CDB-3776 fix header overlay creation when there's no description
CDB-3776 fix header overlay creation when there's no description

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