Fix for nil tables at #1211
Fix for nil tables at #1211

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