Avoid performing payload-related operations in case no fulltext was received from the worker, due to en error.

src/main/java/eu/openaire/urls_controller/services/UrlsServiceImpl.java

@@ -302,6 +302,7 @@ public class UrlsServiceImpl implements UrlsService {
             // We write only the payloads which are connected with retrieved full-texts, uploaded to S3-Object-Store.
             // We continue with writing the "attempts", as we want to avoid re-checking the failed-urls later.
             // The urls which give full-text (no matter if we could not get it from the worker), are flagged as "couldRetry" anyway, so they will be picked-up to be checked again later.
+            hasFulltexts = false;
         } else if ( uploadFullTextsResponse == FileUtils.UploadFullTextsResponse.successful_without_fulltexts )
             hasFulltexts = false;
         else