Fix items.json path issue when path is empty

handler.py

@@ -49,7 +49,8 @@ class EndpointHandler:
             with contextlib.suppress(Exception):
                 loaded = self._load_snapshot_from_hub_latest()
         if not loaded:
-            with open(f"{path}/items.json", "r", encoding="utf-8") as f:
+            items_path = "items.json" if not path else f"{path}/items.json"
+            with open(items_path, "r", encoding="utf-8") as f:
                 items = json.load(f)
             prompts = [it["prompt"] for it in items]
             self.class_ids = [int(it["id"]) for it in items]