Coding Standards: Avoid using confusing `!` condition in Media Librar… #17298

Job	Run time
Performance tests / Run tests	10m 8s
Performance tests (with memcached) / Run tests	10m 9s
Slack Notifications / Prepare notifications	6s
Slack Notifications / Success notifications	2s
Slack Notifications / Failure notifications	0s
Slack Notifications / Cancelled notifications	0s
Slack Notifications / Fixed notifications	0s
Failed workflow tasks	0s
	20m 25s

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