code: def test_side_histogram_no_cmapper(self):
      points = Points(np.random.rand(100, 2))
      plot = bokeh_renderer.get_plot(points.hist())
      plot.initialize_plot()
      adjoint_plot = next(iter(plot.subplots.values()))
      main_plot = adjoint_plot.subplots["main"]
      right_plot = adjoint_plot.subplots["right"]
      self.assertTrue("color_mapper" not in main_plot.handles)
      self.assertTrue("color_mapper" not in right_plot.handles)
  
imports: import datetime
  import numpy
  from bokeh.models import CategoricalColorMapper, DatetimeAxis, LinearColorMapper
  from holoviews.core.overlay import NdOverlay
  from holoviews.element import Dataset, Histogram, Image, Points
  from holoviews.operation import histogram
  from holoviews.plotting.bokeh.util import property_to_dict
  from ...utils import LoggingComparisonTestCase
  from .test_plot import TestBokehPlot, bokeh_renderer
label_desc: Use image node_id 1 for calling the TestSideHistogramPlot obj's underlying member method code with example usage: obj.test_side_histogram_no_cmapper() without return types