Merge branch 'fix-division-by-zero-when-no-milestones' into 'master'

Program does not crash if there are no milestones

See merge request !9
10 jobs for master in 1 minute and 15 seconds (queued for 3 seconds)
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Status Job ID Name Coverage
  Test
passed black #213168

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passed docs_links #213170

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passed docs_spelling #213171

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passed flake8 #213167

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passed isort #213169

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passed pytest #213166

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  Build
passed build_documentation_html #213173

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passed build_package #213172

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  Deploy
passed pages #213174

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passed pages:deploy

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