Unit tests

add test case where `json_str` is set to `None` #36

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Run time

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Job	Run time
Test pyDataverse (3.8)	2m 2s
Test pyDataverse (3.9)	2m 0s
Test pyDataverse (3.10)	2m 6s
Test pyDataverse (3.11)	2m 7s
	8m 15s