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Fixes this staging seeding failure: https://codedotorg.slack.com/archives/C03CK8E51/p1598249784076000
Which occurred because CourseVerisons exist in the DB that don't have associated CourseOfferings, and this case wasn't handled in the
destroy_and_destroy_parent_if_empty
method before. This state shouldn't normally exist, but it did because I added logic to seed CourseVersions before adding the CourseOffering model and seeding logic.