fixed:update changes to code

Author: Tezz03

lesson_26/api/java/api_app/src/main/java/com/codedifferently/lesson26/web/MediaItemsController.java

@@ -46,4 +46,6 @@ public ResponseEntity<MediaItemResponse> getItemById(@PathVariable("id") UUID id
     Optional<MediaItem> matchedItem =
         items.stream().filter(item -> item.getId().equals(id)).findFirst();
     System.out.println("items");
+      return null;
 }
+}