protected function hasValue()
    {
        list($start, $end) = $this->getValue();
        return $start !== null && $start !== '' && $end !== null && $end !== '';
    }
protected function hasValue()
    {
        list($start, $end) = $this->getValue();
        return $start !== null && $start !== '' && $end !== null && $end !== '';
    }
protected function hasValue ( ) { list ( $ start , $ end ) = $ this -> getValue ( ) ; return $ start !== null && $ start !== '' && $ end !== null && $ end !== '' ; }
Returns true if non-empty value specified for the filter.

@return bool
Returns true if non - empty value specified for the filter .