code: public function generate()
  	{
  		// Use the home directory of the current user as file source
  		if ($this->useHomeDir && FE_USER_LOGGED_IN)
  		{
  			$this->import(FrontendUser::class, 'User');
  
  			if ($this->User->assignDir && $this->User->homeDir)
  			{
  				$this->multiSRC = array($this->User->homeDir);
  			}
  		}
  		else
  		{
  			$this->multiSRC = StringUtil::deserialize($this->multiSRC);
  		}
  
  		// Return if there are no files
  		if (empty($this->multiSRC) || !\is_array($this->multiSRC))
  		{
  			return '';
  		}
  
  		// Get the file entries from the database
  		$this->objFiles = FilesModel::findMultipleByUuids($this->multiSRC);
  
  		if ($this->objFiles === null)
  		{
  			return '';
  		}
  
  		return parent::generate();
  	}
docs: Return if there are no files
  
  @return string