Add empty line

Author: yurikunash

src/mcp/server/streamable_http.py

@@ -900,4 +900,4 @@ async def message_router():
                     await write_stream.aclose()
                 except Exception as e:
                     # During cleanup, we catch all exceptions since streams might be in various states
-                    logger.debug(f"Error closing streams: {e}")
+                    logger.debug(f"Error closing streams: {e}")