private function syncAdditionalImages($sourceWikiId, $sourceWikiLang, $deletedImages)
 {
     $wikiData = $this->model->getWikiData($sourceWikiId, $sourceWikiLang, $this->helper);
     $data = $this->getWikiCityImages($wikiData['images'], $deletedImages);
     if (isset($data['city_images'])) {
         $data['city_images'] = json_encode($data['city_images']);
     }
     return $data;
 }