Resolve "Custom excuse types aren't counted correctly in generate_person_list_with_class_register_statistics"

Closes #240 (closed)

added part::backend prio::1 type::bug labels

assigned to @nik

added 3 commits

• f0ae124a - Activate linting of frontend files
• e311aae2 - Reformat
• af849ace - Bump version to 3.0b0 and update changelog

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changed target branch from master to prepare-release-3.0b0

marked this merge request as ready

added 1 commit

• a4a45020 - Fix distinct query for absences with custom excuse types

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added 6 commits

• a4a45020...a1ba1e42 - 5 commits from branch prepare-release-3.0b0
• 75b6bc28 - Merge branch 'prepare-release-3.0b0' into '240-custom-excuse-types-aren-t-counted-correctly-in'

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resolved all threads

added 3 commits

• db7676cf - Fix distinct query for absences with custom excuse types
• 441c8fcb - Use id of the respectie ExtraMark and ExcuseType object when using them as column aliases
• 8459bbab - Correct the redirect_url used to show a generated PDF printout of a class register

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added 8 commits

• 8459bbab...1870ffa0 - 7 commits from branch prepare-release-3.0b0
• 2fa8af88 - Fix distinct query for absences with custom excuse types

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added 3 commits

• 2fa8af88...3990cdd3 - 2 commits from branch prepare-release-3.0b0
• 71aad3cf - Merge branch 'prepare-release-3.0b0' into '240-custom-excuse-types-aren-t-counted-correctly-in'

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mentioned in commit e43c579c

merged