Base::fillParameterFromRequest

protected function fillParameterFromRequest(string $parameterName, array &$arParams, HttpRequest $request = null)
{
	if(!$request)
	{
		$request = $this->request;
	}

	if(!empty($arParams[$parameterName]))
	{
		return;
	}

	$value = $request->get($parameterName);
	if(!empty($value))
	{
		$arParams[$parameterName] = $value;
	}
}