upload is not remembered, image is on form error about vlabsmediabundle HOT 2 CLOSED

    $form->setRequest($request);

    // check all fields of the form 
    $fname = $form->getName();
    foreach($form->getIterator() as $col=>$val)
    {
        $getter = 'get'.ucfirst(str_replace("_","",$col));
        $val = $entity->$getter();
        $sess_name = "_spin_file_upload_{$fname}_$col";

        // if session was already created
        if ($this->get('session')->has($sess_name))
        {
            if ($val === null)
            {
                $setter = 'set'.ucfirst(str_replace("_","",$col));
                $entity->$setter( ( $this->get('session')->get($sess_name) ) );
            }

            // remove the session if the form is valid
            // note: when the user closes the browser on validation errors the session remains.
            if ($form->isValid())
                $this->get('session')->set($sess_name, null);
        }

        // save all images to session, so we can retrieve them if form has validation errors
        if ($val instanceof Picture && !$form->isValid())
            $this->get('session')->set($sess_name, $val);
    }

    // continue normal form action
    if ($form->isValid())
    {