Deletion of nonexisting nodes.

[Ragnar-BY]

I have next code:

DeleteNodes = "MATCH (n) DETACH DELETE n;"
func (s *Service) cleanUp(storage bolt.Conn) error {
	result, err := storage.ExecNeo(DeleteNodes, nil)
	if err != nil {
		return fmt.Errorf("bad DELETE request")
	}
	numResult, err := result.RowsAffected()
	if err != nil {
		return err
	}
	fmt.Printf("Rows Deleted: %d", numResult)
	return nil
}

This code works well but only if database is not null. If there are not nodes in database, then I get error Unrecognized type for stats metadata: map[string]interface {}{"result_consumed_after":0, "type":"w"} in function result.RowsAffected()
In my opinion we should not get error here.