VTK import error workaround

[adam-urbanczyk]

Working around conda-forge/vtk-feedstock#207

[codecov]

Codecov Report

Merging #902 (dd5b3a2) into master (a1df268) will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master     #902   +/-   ##
=======================================
  Coverage   95.91%   95.91%           
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  Files          32       32           
  Lines        7815     7815           
  Branches      846      846           
=======================================
  Hits         7496     7496           
  Misses        186      186           
  Partials      133      133           

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[marcus7070]

Thanks very much @adam-urbanczyk, that looks like it would have taken a lot of effort and skill to diagnose!