[#721] Show selectielijstklasse also if it's not on the zaak #1946

Job	Run time
Build frontend	1m 6s
Run the Django test suite	2m 24s
Build and check documentation	1m 13s
Build docker image (production, docker) / Build image	1m 56s
Build docker image (dev, -dev, dev) / Build image	1m 56s
End-to-end tests, chromium	6m 23s
End-to-end tests, webkit	6m 49s
End-to-end tests, firefox	8m 2s
Run storybook tests	2m 39s
Push Docker image	-1s
	32m 27s

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