Add condition for charset transfer

dan/manager/training.py

@@ -297,6 +297,7 @@ class GenericTrainingManager:
                             if (
                                 "end_conv" in key
                                 and "transfered_charset" in self.params["model_params"]
+                                and self.params["model_params"]["transfered_charset"]
                             ):
                                 self.adapt_decision_layer_to_old_charset(
                                     model_name, key, checkpoint, state_dict_name