code: def flush(self) -> None:
      if self.current_steps:
          self.story_steps.extend(self.current_steps)
          self.current_steps = []
  
file_path: rasa/rasa/shared/core/training_data/story_reader/story_step_builder.py
imports: import logging
  from typing import Text, Optional, Dict, Any, List
  import rasa.shared.core.training_data.structures
  import rasa.shared.utils.io
  from rasa.shared.constants import DOCS_URL_STORIES
  from rasa.shared.core.events import UserUttered, Event
  from rasa.shared.core.training_data.structures import Checkpoint, GENERATED_CHECKPOINT_PREFIX, GENERATED_HASH_LENGTH, STORY_START, StoryStep, RuleStep
label_desc: Use image node_id 9 for calling the StoryStepBuilder obj's underlying member method code with example usage: obj.flush() without return types