gradio header is an empty string

src/hf_eda_mcp/services/dataset_service.py

@@ -811,7 +811,7 @@ class DatasetService:
 def get_dataset_service(hf_api_token: str) -> DatasetService:
     """Get or create the global dataset service instance using current config."""
     config = get_config()
-    if hf_api_token is None:
+    if hf_api_token is None or len(hf_api_token) == 0:
         hf_api_token = config.hf_token
     dataset_service = DatasetService(
         cache_dir=config.cache_dir,