code: public function generate()
  	{
  		if (TL_MODE == 'BE')
  		{
  			$objTemplate = new BackendTemplate('be_wildcard');
  			$objTemplate->wildcard = '### ' . Utf8::strtoupper($GLOBALS['TL_LANG']['FMD']['newsletterreader'][0]) . ' ###';
  			$objTemplate->title = $this->headline;
  			$objTemplate->id = $this->id;
  			$objTemplate->link = $this->name;
  			$objTemplate->href = 'contao/main.php?do=themes&amp;table=tl_module&amp;act=edit&amp;id=' . $this->id;
  
  			return $objTemplate->parse();
  		}
  
  		// Set the item from the auto_item parameter
  		if (!isset($_GET['items']) && Config::get('useAutoItem') && isset($_GET['auto_item']))
  		{
  			Input::setGet('items', Input::get('auto_item'));
  		}
  
  		// Do not index or cache the page if no news item has been specified
  		if (!Input::get('items'))
  		{
  			/** @var PageModel $objPage */
  			global $objPage;
  
  			$objPage->noSearch = 1;
  			$objPage->cache = 0;
  
  			return '';
  		}
  
  		$this->nl_channels = StringUtil::deserialize($this->nl_channels);
  
  		// Do not index or cache the page if there are no channels
  		if (empty($this->nl_channels) || !\is_array($this->nl_channels))
  		{
  			/** @var PageModel $objPage */
  			global $objPage;
  
  			$objPage->noSearch = 1;
  			$objPage->cache = 0;
  
  			return '';
  		}
  
  		return parent::generate();
  	}
docs: Display a wildcard in the back end
  
  @return string