code: def test_allow_waypoints_none(self):
      layer = Directions(self.start, self.end, waypoints=None)
      assert layer.get_state()["waypoints"] == []
  
imports: import unittest
  import pytest
  import traitlets
  from ..directions import Directions, DEFAULT_STROKE_COLOR
label_desc: Use image node_id 9 for calling the DirectionsLayer obj's underlying member method code with example usage: obj.test_allow_waypoints_none() without return types