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I would say “null” is not available in the kernel langage. As a workaround, I suggest modeling a helper field, calculated as “true if FieldFilled(UI_Pfad)” and false otherwise, now you should be able to access it in your expression…
The undefined fields should work exactly the same as the defined but empty fields in Expressions.
There’s an open bug ticket, A12-16232, which is tackling this problem in the 2024.06 release line.
The workaround proposed by @marieestelle-firm-summit would work in the meantime. You can model a computed helper Field (Boolean):
| Precondition | Calculation |
|---|---|
| FieldFilled(UI_Pfad) | True |
| FieldNotFilled(UI_Pfad) | False |
If you use this helper Field in the case, then everything works.
case [UI_Pfad_helper]= "false" {"Allgemeiner Kommentar"}
The downside is that you have to maintain this extra field.
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The fix for A12-16232 mentioned in the thread is planned for 2024.06-ext3 release.