update model checkpoint switch code

        return options

    def set_config(self, req: Dict[str, Any]):

        checkpoint_key="sd_model_checkpoint"

        if checkpoint_key in req and  str(req[checkpoint_key]) not in checkpoint_alisases:

            raise RuntimeError(f"model {v!r} not found")

        for k, v in req.items():

            if k == "sd_model_checkpoint":

                checkpoint_info = checkpoint_alisases.get(v, None)

                if checkpoint_info is None:

                    print(f"model [{v}] not founded, skip config saving process")

                    return 

            shared.opts.set(k, v)

        shared.opts.save(shared.config_filename)