Update graphgen/models/partitioner/anchor_bfs_partitioner.py

Co-authored-by: Copilot <[email protected]>

Author: ChenZiHong-Gavin

graphgen/models/partitioner/anchor_bfs_partitioner.py

@@ -101,7 +101,7 @@ async def _pick_anchor_ids(
 
         anchor_ids: Set[str] = set()
         for node_id, meta in nodes:
-            node_type = str(meta.get("entity_type") or "").lower()
+            node_type = str(meta.get("entity_type", "")).lower()
             if self.anchor_type.lower() in node_type:
                 anchor_ids.add(node_id)
         return anchor_ids