fix comments used before assigned

            old_step.copy_to(new_step, step_mapping, user=user)

        copied_workflow.steps = copied_steps

        copied_comments = []

        for comment in self.comments:

            copied_comments.append(comment.copy())

        copied_comments = [comment.copy() for comment in self.comments]

        steps_by_id = {s.order_index: s for s in copied_workflow.steps}

        comments_by_id = {c.order_index: c for c in copied_workflow.comments}

        comments_by_id = {c.order_index: c for c in copied_comments}

        # copy comment relationships

        for old_comment, new_comment in zip(self.comments, copied_comments):