Small cleanup in table fetching code
Small cleanup in table fetching code

This is in preparation to possible fixes for the unexistent table
proble reported in #824

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