cleaned code

lightrag/kg/chroma_impl.py

@@ -183,7 +183,6 @@ class ChromaVectorDBStorage(BaseVectorStorage):
             logger.error(f"Error during ChromaDB query: {str(e)}")
             raise
 
-
     async def index_done_callback(self) -> None:
         # ChromaDB handles persistence automatically
         pass
@@ -194,4 +193,4 @@ class ChromaVectorDBStorage(BaseVectorStorage):
 
     async def delete_entity_relation(self, entity_name: str) -> None:
         """Delete relations for a given entity by scanning metadata"""
-        raise NotImplementedError
+        raise NotImplementedError