Handling invalid output object from engines #371

Job	Run time
CI linters via Tox (lintreadme)	27s
cwltest release test	3m 32s
CI tests via Tox (3, 8, lint)	21s
CI linters via Tox (pydocstyle)	12s
CI tests via Tox (3, 8, unit)	1m 3s
CI tests via Tox (3, 8, mypy)	43s
CI tests via Tox (3, 8, bandit)	21s
CI tests via Tox (3, 9, lint)	27s
CI tests via Tox (3, 9, unit)	1m 10s
CI tests via Tox (3, 9, mypy)	43s
CI tests via Tox (3, 9, bandit)	15s
CI tests via Tox (3, 10, lint)	26s
CI tests via Tox (3, 10, unit)	1m 21s
CI tests via Tox (3, 10, mypy)	34s
CI tests via Tox (3, 10, bandit)	21s
CI tests via Tox (3, 11, lint)	49s
CI tests via Tox (3, 11, unit)	1m 1s
CI tests via Tox (3, 11, mypy)	30s
CI tests via Tox (3, 11, bandit)	11s
CI tests via Tox (3, 12, lint)	23s
CI tests via Tox (3, 12, unit)	1m 55s
CI tests via Tox (3, 12, mypy)	58s
CI tests via Tox (3, 12, bandit)	15s
	17m 58s

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