Media: Prevent Multisite fatal error in legacy file rewrites. #41444

Job	Run time
Test with SCRIPT_DEBUG enabled / Run E2E tests	4m 40s
Test with SCRIPT_DEBUG disabled / Run E2E tests	5m 5s
Slack Notifications / Prepare notifications	3s
Slack Notifications / Success notifications	3s
Slack Notifications / Failure notifications	0s
Slack Notifications / Fixed notifications	0s
Slack Notifications / Cancelled notifications	0s
Failed workflow tasks	0s
	9m 51s

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