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scatter(..., marker='') raises on drawing with mpl3.3.1 #18254

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@MaozGelbart

Description

@MaozGelbart

Bug report

Bug summary

plt.scatter() raises upon drawing when called withmarker='' (no errors with 3.3.0).
This change of behavior broke seaborn.

Code for reproduction

importmatplotlib.pyplotaspltplt.scatter([], [],marker='')# fails also with plt.scatter([1,2,3], [1,2,3], marker='')plt.show()

Actual outcome

Traceback (most recent call last):  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/backends/backend_macosx.py", line 61, in _draw    self.figure.draw(renderer)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper    return draw(artist, renderer, *args, **kwargs)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/figure.py", line 1863, in draw    mimage._draw_list_compositing_images(  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/image.py", line 131, in _draw_list_compositing_images    a.draw(renderer)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper    return draw(artist, renderer, *args, **kwargs)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/cbook/deprecation.py", line 411, in wrapper    return func(*inner_args, **inner_kwargs)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/axes/_base.py", line 2748, in draw    mimage._draw_list_compositing_images(renderer, self, artists)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/image.py", line 131, in _draw_list_compositing_images    a.draw(renderer)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper    return draw(artist, renderer, *args, **kwargs)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/collections.py", line 931, in draw    Collection.draw(self, renderer)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/artist.py", line 41, in draw_wrapper    return draw(artist, renderer, *args, **kwargs)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/collections.py", line 385, in draw    extents = paths[0].get_extents(combined_transform)  File "/Users/maoz/.local/lib/python3.8/site-packages/matplotlib/path.py", line 603, in get_extents    return Bbox([xys.min(axis=0), xys.max(axis=0)])  File "/Users/maoz/miniconda/envs/seaborn_devenv/lib/python3.8/site-packages/numpy/core/_methods.py", line 43, in _amin    return umr_minimum(a, axis, None, out, keepdims, initial, where)ValueError: zero-size array to reduction operation minimum which has no identity

Expected outcome

Not to fail.

Matplotlib version

  • Operating system: MacOS
  • Matplotlib version: 3.3.1
  • Matplotlib backend (print(matplotlib.get_backend())): MacOSX (also reproduces with %inline)
  • Python version: 3.8.3
  • Jupyter version (if applicable):
  • Other libraries: numpy 1.19.1

matplotlib installed through pip

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