[#721] Show selectielijstklasse also if it's not on the zaak #1947

Job	Run time
Build frontend	1m 14s
Run the Django test suite	2m 13s
Build and check documentation	2m 26s
Build docker image (production, docker) / Build image	1m 56s
Build docker image (dev, -dev, dev) / Build image	1m 54s
End-to-end tests, chromium	6m 9s
Run storybook tests	3m 48s
End-to-end tests, webkit	7m 30s
End-to-end tests, firefox	8m 3s
Push Docker image	0s
	35m 13s

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