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installation fails on CircleCI

See original GitHub issue

ModuleNotFoundError: No module named 'tvtk.custom.generic_render_window_interactor'

During handling of the above exception, another exception occurred:

Traceback (most recent call last):
  File "<string>", line 1, in <module>
  File "/home/circleci/.local/lib/python3.7/site-packages/mayavi/mlab.py", line 16, in <module>
    from mayavi.tools.camera import view, roll, yaw, pitch, move
  File "/home/circleci/.local/lib/python3.7/site-packages/mayavi/tools/camera.py", line 24, in <module>
    from .engine_manager import get_engine
  File "/home/circleci/.local/lib/python3.7/site-packages/mayavi/tools/engine_manager.py", line 14, in <module>
    from mayavi.core.engine import Engine
  File "/home/circleci/.local/lib/python3.7/site-packages/mayavi/core/engine.py", line 28, in <module>
    from mayavi.core.base import Base
  File "/home/circleci/.local/lib/python3.7/site-packages/mayavi/core/base.py", line 19, in <module>
    from tvtk.pyface.tvtk_scene import TVTKScene
  File "/home/circleci/.local/lib/python3.7/site-packages/tvtk/pyface/tvtk_scene.py", line 44, in <module>
    class TVTKScene(HasPrivateTraits):
  File "/home/circleci/.local/lib/python3.7/site-packages/tvtk/pyface/tvtk_scene.py", line 175, in TVTKScene
    interactor = Property(Instance(tvtk.GenericRenderWindowInteractor))
  File "tvtk_classes/tvtk_helper.py", line 481, in <lambda>
  File "tvtk_classes/tvtk_helper.py", line 47, in get_class
  File "tvtk_classes/tvtk_helper.py", line 28, in get_module
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 668, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 638, in _load_backward_compatible
  File "tvtk_classes/generic_render_window_interactor.py", line 29, in <module>
  File "<frozen importlib._bootstrap>", line 983, in _find_and_load
  File "<frozen importlib._bootstrap>", line 967, in _find_and_load_unlocked
  File "<frozen importlib._bootstrap>", line 668, in _load_unlocked
  File "<frozen importlib._bootstrap>", line 638, in _load_backward_compatible
  File "tvtk_classes/render_window_interactor.py", line 32, in <module>
  File "tvtk_classes/render_window_interactor.py", line 446, in RenderWindowInteractor
NameError: name 'nan' is not defined

@GuillaumeFavelier do you know what caused this?

This was in the build_docs job from #7619