Problem s prazdnym JSON, snippet v controlu

Ahojte, mam trosku problem s ajaxovym snippetem. Mam sablonu @layout.latte, v te {include #content}.
Pak uz je sablona Site.default.latte, ve ktere mam

{block #content}
<h2 class="nazev-stranky">{$site->site_heading}</h2>
{foreach $contents as $content}
{if $content->content_type == 'gallery'}
    {var $cntrl = 'galControl' . $content->content_id}
    {control $cntrl:front}
{/if}
{if $content->content_type == 'poll'}
    {var $cntrl = 'pollControl' . $content->content_id}
    {control $cntrl:front}
{/if}
{if $content->content_type == 'text'}
    {var $cntrl = 'textControl' . $content->content_id}
    {control $cntrl:front}
{/if}
{if $content->content_type == 'article'}
    {var $cntrl = 'artControl' . $content->content_id}
    {control $cntrl:front}
{/if}
{if $content->content_type == 'file'}
    {var $cntrl = 'fileControl' . $content->content_id}
    {control $cntrl:front}
{/if}
{/foreach}
{/block}

a v controlu article:front

{snippet article}
<div class="clanky">
    {if is_file(WWW_DIR . '/articles/' . $content->art_image)}<div class="nahled"><a href="{$basePath . '/articles/' . $content->art_image}" rel="lightbox"><img src="{$baseUri.'/'}{='/articles/' . $content->art_image|resize:'100x80'}" class="fotka"></a></div>{/if}
    <div class="popis">
        {if $content->content_show_date}<p class="datum">{$content->content_created|date:'%d. %m. %Y'}</p>{/if}
        {if $content->content_as_dir}<h2><a n:href="showWhole!" class="ajax">{$content->art_heading}</a></h2>
        {!$content->art_text|htmlTruncate:100}
        {else}
        {if $content->content_show_name || $content->content_as_dir}<h2>{$content->art_heading}</a>{/if}
        {!$content->art_text}
        {/if}
    </div>
</div>
{/snippet}

v controlu mam

public function handleShowWhole() {
    $this->currentArticle->content_as_dir = FALSE;
    if($this->getPresenter()->isAjax()) {
        $this->invalidateControl('article');
    } else {
        $this->redirect('this');
    }
}

V jinem modulu v administraci mi obdobna struktura funguje naprosto perfektne, zde ovsem vraci prazdny JSON… Nevite co s tim?