changed check if object exist to throw an exception if connection to …

…minio can't be established

src/main/java/de/unistuttgart/iste/gits/media_service/service/MediaService.java

@@ -606,7 +606,7 @@ private boolean doesObjectExist(final String name, final String bucketName) {
             return false;
         } catch (final Exception e) {
             log.error("Error while checking if object exists", e);
-            return false;
+            throw new RuntimeException(e.getMessage());
         }
     }