fix(modelloader): convert ModelCardData to dict before saving model_info.json

modules/modelloader.py

@@ -99,7 +99,8 @@ def download_diffusers_model(hub_id: str, cache_dir: str | None = None, download
         shared.state.end(jobid)
         return None
     try:
-        model_info_dict = hf.model_info(hub_id).cardData if pipeline_dir is not None else None
+        card = hf.model_info(hub_id).cardData
+        model_info_dict = card.to_dict() if hasattr(card, 'to_dict') else card
     except Exception:
         model_info_dict = None
     if model_info_dict is not None and "prior" in model_info_dict: # some checkpoints need to be downloaded as "hidden" as they just serve as pre- or post-pipelines of other pipelines