fixup! Fix all uses of UsageKeys and CourseKeys, and all of their tests.
fixup! Fix all uses of UsageKeys and CourseKeys, and all of their tests.
fixup! Fix all uses of UsageKeys and CourseKeys, and all of their tests.
fixup! Fix all uses of UsageKeys and CourseKeys, and all of their tests.
Fixed CourseKeyField validation to validate CourseKeys properly
Make LocationKeyFields validate properly