Updated.

restlet/curd.go

@@ -378,6 +378,9 @@ func (h DefaultCURDHandler) update(ctx RequestContext, url_params Parameters, qu
             queryControl = qc
         }
     }
+    if len(updateCols)<1{
+        return Failure_Response(ERROR_BAD_REQUEST, "empty update columns...")
+    }
 
     log.Debugln("DefaultCURDHandler.update> QueryControl:", queryControl)
     var pk_mapping = _build_params_map(h.table, url_params, h.pks...)