Merge pull request #540 from maykinmedia/fix/539-resultaat-can-be-none #1406

Job	Run time
Run the Django test suite	2m 22s
Build and check documentation	1m 3s
Build frontend	1m 6s
Build Docker image	2m 20s
Run storybook tests	2m 49s
End-to-end tests, chromium	4m 41s
End-to-end tests, firefox	5m 47s
End-to-end tests, webkit	4m 58s
Push Docker image	41s
	25m 47s

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