fix model loading twice in some situations

        self.comments = []

    def get_prompt_lengths(self, text):

        if self.clip is None:

            return "-", "-"

        _, token_count = self.clip.process_texts([text])

        return token_count, self.clip.get_target_prompt_token_count(token_count)

    def get_sd_model(self):

        if self.sd_model is None:

            with self.lock:

                if self.sd_model is not None:

                    return self.sd_model

                try:

                    load_model()

                except Exception as e: