protected function compileEmpty($key, $masque)
    {
        if (!isset($this->inputs[$key])) {
            $this->fails = true;

            $this->last_message = $message = $this->lexique('empty', $key);

            $this->errors[$key][] = [
                "masque" => $masque,
                "message" => $message
            ];
        }
    }