Trivals. (#8597)

### What problem does this PR solve?

### Type of change

- [x] Bug Fix (non-breaking change which fixes an issue)

rag/svr/task_executor.py

@@ -300,11 +300,12 @@ async def build_chunks(task, progress_callback):
                         d["image"].close()  # Close original image
                         d["image"] = converted_image
                     d["image"].save(output_buffer, format='JPEG')
-                    d["image"].close()  # Close PIL image after saving
                 
                 async with minio_limiter:
                     await trio.to_thread.run_sync(lambda: STORAGE_IMPL.put(task["kb_id"], d["id"], output_buffer.getvalue()))
                 d["img_id"] = "{}-{}".format(task["kb_id"], d["id"])
+                if not isinstance(d["image"], bytes):
+                    d["image"].close()
                 del d["image"]  # Remove image reference
                 docs.append(d)
             finally: