public function setValidator($validator = null) { if (count($this->getValidators()) === 0 && $validator instanceof FormHandler\Validator\FunctionCallable && is_array($validator->getCallable())) { $callable = $validator->getCallable(); //detect if it is an optional validator if ($callable[0] instanceof Validator && substr($callable[1], 0, 1) !== '_') { parent::setValidator(new \FormHandler\Validator\NotEmpty()); } } return parent::setValidator(FormHandler::parseValidator($validator, $this)); }