code: def test_color_dict_empty(self, xyz_levels: XYZ_Levels) -> None:
      x, y, z, levels = xyz_levels
      colors_dict = {}
      with pytest.raises(
          ValueError, match="PaletteCollection is empty"
      ):
          from_contour(x, y, z, levels, line_color=colors_dict)
  
imports: from __future__ import annotations
  import pytest
  from typing import TYPE_CHECKING
  import numpy
  from bokeh.plotting.contour import FillData, LineData, contour_data, from_contour
label_desc: Use image node_id 5 for calling the Test_from_contour obj's underlying member method code with example usage: obj.test_color_dict_empty(xyz_levels) without return types