Back to pull request #385

Use is_missing property in ReqPackage.is_conflicting() for DRYness #2058

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Job	Run time
tox env type	27s
test 3.12	56s
tox env dev	14s
test 3.11	30s
tox env readme	16s
test 3.10	35s
test 3.9	32s
test 3.8	1m 2s
test pypy3.10	1m 3s
test pypy3.9	1m 7s
	6m 42s