Географическая карта Google Data Studio Неверное поле для области масштабирования

In search.php before sending $rows in json_encode() give one condition that will check $row is empty or not.like :
if(!empty($res))
    echo json_encode(array('status'=>'success','result'=>$rows));
else
    echo json_encode(array('status'=>'failed','result'=>[]));
In ajax check 
success: function(html)
{
    if(html.status=='success')
    {
            $res.show();
            $res.append(result.html);
            console.log(result.html);
     }
}
may be it will work..