code: def test_scatter_ellipsis_value_missing(self):
      try:
          hv.Scatter(range(10))[..., "Non-existent"]
      except Exception as e:
          if (
              str(e)
              != "'Non-existent' is not an available value dimension"
          ):
              raise AssertionError("Incorrect exception raised.")
  
imports: import numpy
  import holoviews
  from holoviews.element.comparison import ComparisonTestCase
label_desc: Use image node_id 5 for calling the TestEllipsisCharts obj's underlying member method code with example usage: obj.test_scatter_ellipsis_value_missing() without return types