cleaned code

lightrag/kg/json_kv_impl.py

@@ -21,7 +21,7 @@ class JsonKVStorage(BaseKVStorage):
         self._data: dict[str, Any] = load_json(self._file_name) or {}
         self._lock = asyncio.Lock()
         logger.info(f"Load KV {self.namespace} with {len(self._data)} data")
-        
+
     async def index_done_callback(self):
         write_json(self._data, self._file_name)
 
@@ -46,4 +46,4 @@ class JsonKVStorage(BaseKVStorage):
         self._data.update(left_data)
 
     async def drop(self) -> None:
-        self._data = {}
+        self._data = {}