[#4899] Fix optional serializer fields in ZaakOptionsSerializer #14798

Job	Run time
Build and check documentation	3m 12s
Set up docker build 'dynamic' env variables	1s
End-to-end tests, chromium	13m 46s
End-to-end tests, firefox	16m 25s
Run the Django test suite	8m 17s
Run the Django test suite in reverse	5m 51s
End-to-end tests, webkit	12m 0s
docker_build (production) / Build image	2m 59s
docker_build (extensions, token_exchange,prefill_haalcentraalhr, all-extensions-) / Build image	2m 49s
Simulate upgrading instances (2.7.4)	1m 38s
Scan docker image	2m 12s
Simulate upgrading instances (2.7.8)	1m 24s
Check for unexepected OAS changes	5s
Generate Postman collection from OAS	10s
Validate OAS	16s
Generate SDKs from OAS	34s
Push Docker image	0s
update-docker-readme	0s
	1h 11m 39s

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