code: def test_trace_segments_none():
      """Test the trace_segments function on a blank image"""
      image = numpy.zeros((10, 20), bool)
      module = cellprofiler.modules.untangleworms.UntangleWorms()
      i, j, label, order, distance, count = module.trace_segments(image)
      assert count == 0
      for x in (i, j, label, order, distance):
          assert len(x) == 0
  
imports: import base64
  import io
  import os
  import tempfile
  import zlib
  import imageio
  import centrosome.outline
  import numpy
  import scipy.ndimage
  import cellprofiler_core.image
  import cellprofiler_core.measurement
  import cellprofiler_core.modules
  import cellprofiler.modules.untangleworms
  import cellprofiler_core.object
  import cellprofiler_core.pipeline
  import cellprofiler_core.preferences
  import cellprofiler_core.setting
  import cellprofiler_core.workspace
  import tests.frontend.modules
label_desc: Use image node_id 7 for calling a global function with example usage: test_trace_segments_none() without return types