Merge branch 'hotfix/zdf_nullpointer' into hotfix/3.1.278

Author: alex1702

src/main/java/mServer/crawler/sender/zdf/tasks/ZdfFilmTask.java

@@ -64,7 +64,7 @@ private static DatenFilm createFilm(final ZdfFilmDto zdfFilmDto, final DownloadD
 
   @Override
   protected void processRestTarget(ZdfFilmDto aDTO, WebTarget aTarget) {
-    final Optional<DownloadDto> downloadDto = deserialize(aTarget, OPTIONAL_DOWNLOAD_DTO_TYPE_TOKEN);
+    final Optional<DownloadDto> downloadDto = deserializeOptional(aTarget, OPTIONAL_DOWNLOAD_DTO_TYPE_TOKEN);
     if (downloadDto.isPresent()) {
       addFilm(aDTO, downloadDto.get());
     } else {