error handling

cypher/convertQuery.go

@@ -17,6 +17,10 @@ func (s *Service) ConvertQuery(totalJSONQuery *entity.IncomingQueryJSON) (*strin
 
 	query, rest, isRest := checkForQueryCluster(queryJSON)
 
+	if query == nil {
+		return nil, errors.New("Invalid query")
+	}
+
 	if isRest {
 		fmt.Println("Rest:")
 		fmt.Println(rest)