Resolve "substitution planning "cancelled" checkbox does not have false as value when unchecked actively"

Closes #241 (closed)

changed milestone to /AlekSIS%"[NLnet #1 (closed)] Implement intelligent substitution planning"

added part::frontend type::bug labels

assigned to @yuha

added 6 commits

• 104f7db5...24e0a5e7 - 6 commits from branch master

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added 1 commit

• aaff4460 - Normalise cancelled value also on create

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added 1 commit

• f5ada65d - Add id field in amend lesson patch mutation

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marked this merge request as ready

assigned to @hansegucker and unassigned @yuha

added 1 commit

• fb695786 - Apply 1 suggestion(s) to 1 file(s)

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added 3 commits

• c1942fc0 - Normalise cancelled value also on create
• 9ff3f2a7 - Add id field in amend lesson patch mutation
• c48408c0 - Apply 1 suggestion(s) to 1 file(s)

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resolved all threads

merged

mentioned in commit 3c2a4aa0