Simplified error handling codestyle in ZGW fetch-functions

[Bartvaderkin]

No description provided.

[vaszig]

Maybe we should fix this in open_inwoner/haalcentraal/utils.py as well, since you did it nicer now!Or not?Because I see we use it in cases, catalog, documents and formapi as well.

[Bartvaderkin]

Good idea, I appended a commit for this.

[codecov-commenter]

Codecov Report

Merging #562 (7ef810e) into develop (6806072) will increase coverage by 0.23%.
The diff coverage is 56.00%.

@@             Coverage Diff             @@
##           develop     #562      +/-   ##
===========================================
+ Coverage    96.49%   96.73%   +0.23%     
===========================================
  Files          546      546              
  Lines        19467    19395      -72     
===========================================
- Hits         18785    18761      -24     
+ Misses         682      634      -48     

Impacted Files	Coverage Δ
src/open_inwoner/openzaak/formapi.py	83.87% <0.00%> (+7.40%)	⬆️
src/open_inwoner/openzaak/catalog.py	64.28% <37.50%> (+9.87%)	⬆️
src/open_inwoner/haalcentraal/utils.py	95.08% <50.00%> (+4.03%)	⬆️
src/open_inwoner/openzaak/cases.py	86.70% <63.63%> (+8.17%)	⬆️
src/open_inwoner/openzaak/documents.py	94.11% <100.00%> (-0.48%)	⬇️

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