class_docstr: Tests allowable data formats when constructing
  the basic Element types.
class_docstr_tok: ["Tests","allowable","data","formats","when","constructing","the","basic","Element","types","."]
code: def test_empty_element_constructor(self):
      failed_elements = []
      for name, el in param.concrete_descendents(Element).items():
          if name == "Sankey":
              continue
          if issubclass(el, (Annotation, BaseShape, Div, Tiles)):
              continue
          try:
              el([])
          except Exception:
              failed_elements.append(name)
      self.assertEqual(failed_elements, [])
  
imports: import numpy
  import pandas
  import param
  from holoviews import RGB, Annotation, Area, Bars, BoxWhisker, Contours, Curve, Dataset, Dimension, Div, Element, ErrorBars, Graph, HeatMap, Histogram, Image, Path, Points, Polygons, QuadMesh, Raster, Scatter, Spikes, Tiles, TriMesh, VectorField
  from holoviews.element.comparison import ComparisonTestCase
  from holoviews.element.path import BaseShape
label_desc: Use image node_id 2 for calling the ElementConstructorTest obj's underlying member method code with example usage: obj.test_empty_element_constructor() without return types