Do not panic if there are no vulnerabilities / Fix severity parsing #3369

Job	Run time
e2e (v1.27.11)	34m 45s
test-docker-build (base)	32s
e2e (v1.29.2)	35m 5s
integration (v1.27.11)	23m 11s
test-docker-build (git)	1m 11s
unit	3m 10s
integration (v1.29.2)	23m 11s
test-docker-build (image-processing)	47s
test-docker-build (waiter)	33s
	2h 2m 25s

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