fix: delete useless code

Author: ChenZiHong-Gavin

graphgen/models/kg_builder/light_rag_kg_builder.py

@@ -168,19 +168,6 @@ async def merge_edges(
             logger.warning("Edge (%s, %s) has missing nodes.", src_id, tgt_id)
             return {}
 
-        # for insert_id in [src_id, tgt_id]:
-        #     if not kg_instance.has_node(insert_id):
-        #         kg_instance.upsert_node(
-        #             insert_id,
-        #             node_data={
-        #                 "entity_type": "UNKNOWN",
-        #                 "entity_name": insert_id,
-        #                 "description": "",
-        #                 "source_id": source_id,
-        #                 "length": self.tokenizer.count_tokens(description),
-        #             },
-        #         )
-
         description = await self._handle_kg_summary(
             f"({src_id}, {tgt_id})", description
         )