Adds verification for parameters and user existence
Adds verification for parameters and user existence

splashblot/dronedb,UCL-ShippingGroup/cartodb-1,codeandtheory/cartodb,codeandtheory/cartodb,CartoDB/cartodb,CartoDB/cartodb,bloomberg/cartodb,bloomberg/cartodb,CartoDB/cartodb,CartoDB/cartodb,nuxcode/cartodb,UCL-ShippingGroup/cartodb-1,splashblot/dronedb,nuxcode/cartodb,bloomberg/cartodb,splashblot/dronedb,thorncp/cartodb,splashblot/dronedb,nyimbi/cartodb,bloomberg/cartodb,CartoDB/cartodb,nuxcode/cartodb,nyimbi/cartodb,UCL-ShippingGroup/cartodb-1,UCL-ShippingGroup/cartodb-1,nyimbi/cartodb,nuxcode/cartodb,thorncp/cartodb,thorncp/cartodb,splashblot/dronedb,nyimbi/cartodb,codeandtheory/cartodb,thorncp/cartodb,bloomberg/cartodb,thorncp/cartodb,codeandtheory/cartodb,UCL-ShippingGroup/cartodb-1,codeandtheory/cartodb,nyimbi/cartodb,nuxcode/cartodb