framework/data/DataFilter.php
public function __isset($name)
    {
        if ($name === $this->filterAttributeName) {
            return $this->getFilter() !== null;
        }

        return parent::__isset($name);
    }
public function __isset($name)
    {
        if ($name === $this->filterAttributeName) {
            return $this->getFilter() !== null;
        }

        return parent::__isset($name);
    }
public function __isset ( $ name ) { if ( $ name === $ this -> filterAttributeName ) { return $ this -> getFilter ( ) !== null ; } return parent :: __isset ( $ name ) ; }
{@inheritdoc}
{