fix saving model w/o default config

Author: ylacombe

src/transformers/configuration_utils.py

@@ -1033,6 +1033,7 @@ def _get_non_default_generation_parameters(self) -> Dict[str, Any]:
             if decoder_config is not self:
                 default_config = decoder_config.__class__()
             else:
+                default_config = None
                 decoder_config = None
 
         # If it is a composite model, we want to check the subconfig that will be used for generation

src/transformers/models/moshi/convert_moshi_transformers.py

@@ -223,6 +223,8 @@ def convert_checkpoint(
     original_checkpoint.update({f"audio_encoder.{key}": value for (key, value) in audio_checkpoint.items()})
 
     model = _convert_model(original_checkpoint, model, convert_list, device, config)
+    
+    # TODO: set generation config
 
     model.save_pretrained(pytorch_dump_folder_path)