Merge branch 'fix/python-ex2-mesh-size' into 'master'

[python][ex2] avoid warning, set mesh size in domain

See merge request tools/frackit!204
12 jobs for master in 10 minutes and 14 seconds (queued for 2 seconds)
Status Job ID Name Coverage
  Build
passed build clang-10 occ-7.5 #6602

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passed build clang-8 occ-7.3 #6601

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passed build_doc #6598

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passed build gcc-7 occ-7.3 #6599

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passed build gcc-9 occ-7.5 #6600

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  Test
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passed test clang-8 occ-7.3 #6605

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passed test gcc-7 occ-7.3 #6603

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passed test gcc-9 occ-7.5 #6604

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  Coverage
passed coverage report #6607

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93.9%
 
  Deploy
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passed pages:deploy

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