Merge pull request #2528 from sebix/fix-shadowserver-valueerror-syntax #1238

Job	Run time
Run unit tests with pytest (3.7, full)	5m 0s
Run unit tests with pytest (3.7, basic)	1m 52s
Run unit tests with pytest (3.8, full)	5m 43s
Run unit tests with pytest (3.8, basic)	1m 55s
Run unit tests with pytest (3.9, full)	5m 21s
Run unit tests with pytest (3.9, basic)	1m 53s
Run unit tests with pytest (3.10, full)	5m 24s
Run unit tests with pytest (3.10, basic)	1m 54s
Run unit tests with pytest (3.11, full)	4m 48s
Run unit tests with pytest (3.11, basic)	1m 51s
	35m 41s

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