F fix assure in list

Summary

For https://gitlab.indiscale.com/caosdb/internal/all/-/issues/530 (or https://gitlab.com/caosdb/caosdb-advanced-user-tools/-/issues/40). Fixes a specific bug whereby assure_object_is_in_list would fail on update when adding an object to an initially empty list.

Focus

The fix is only two lines in cfood.py and there is a new integration test reproducing the problem in https://gitlab.com/caosdb/caosdb-advanced-user-tools/-/issues/40.

Test Environment

Integration test should be sufficient, but feel free to experiment manually with similar cases (don't forget to set the global guard level to UPDATE if you want to test it manually.)

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assigned to @florian

marked the checklist item All automated tests pass as completed

marked the checklist item Up-to-date CHANGELOG.md (or not necessary) as completed

marked the checklist item Annotations in code (Gitlab comments) as completed

added 1 commit

• f57f7f31 - DOC: Fix typo in header

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changed the description

marked the checklist item Reference related issues as completed

requested review from @daniel

added 3 commits

• 50e13c60 - MAINT: Made the code a bit more readable.
• 6a402886 - TEST: Reset example files to initial state.
• 7c7d9f43 - STY: Wrapped long lines in test.sh

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resolved all threads

added 1 commit

• 65e379db - DOC: Typos in Changelog.

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marked the checklist item I understand the intent of this MR as completed

marked the checklist item All automated tests pass as completed

marked the checklist item Up-to-date CHANGELOG.md (or not necessary) as completed

marked the checklist item The test environment setup works and the intended behavior is reproducible in the test as completed

marked the checklist item In-code documentation and comments are up-to-date. as completed

approved this merge request

LGTM, I added a few small changes. Please merge or revert at will.