TST: Make NamedTemporaryFiles Windows-compatible

Summary

Fixes #194 (closed). We mainly add meaningful treatment of NA values to converters.match_name_and_value where they are now interpreted as empty strings. This fixes the issue in tables but also in generic structure elements like TextElement (see new unit test).

Focus

Can you imagine unintended side effects of the new behavior?

Test Environment

New unit test should be sufficient.

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• All automated tests pass
• Reference related issues
• Up-to-date CHANGELOG.md (or not necessary)
• Up-to-date JSON schema (or not necessary)
• Appropriate user and developer documentation (or not necessary)
  • How do I use the software? Assume "stupid" users.
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  • Intent of new code
  • Problems with old code
  • Why this implementation?

Check List for the Reviewer

• I understand the intent of this MR
• All automated tests pass
• Up-to-date CHANGELOG.md (or not necessary)
• Appropriate user and developer documentation (or not necessary)
• The test environment setup works and the intended behavior is reproducible in the test environment
• In-code documentation and comments are up-to-date.
• Check: Are there specifications? Are they satisfied?

For further good practices have a look at our review guidelines.

assigned to @florian

marked the checklist item Reference related issues as completed

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

marked the checklist item Up-to-date JSON schema (or not necessary) as completed

marked the checklist item Appropriate user and developer documentation (or not necessary) as completed

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

marked the checklist item All automated tests pass as completed

requested review from @daniel

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 Appropriate user and developer documentation (or not necessary) as completed

added 1 commit

• 9f926381 - Revert whitespace changes.

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added 1 commit

• 22b53f7a - STY, DOC: A few small changes to documentation and regression test.

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resolved all threads

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

marked the checklist item Check: Are there specifications? Are they satisfied? as completed