raoul2000\workflow\source\file\GraphmlLoader::isBlank PHP Метод

private isBlank ( string $str ) : boolean
$str	string
Результат	boolean	TRUE if the string passed as argument is null, empty, or made of space character(s)

    private function isBlank($str)
    {
        return !isset($str) || strlen(trim($str)) == 0;
    }

GraphmlLoader