Exception occurs when trying to sort by Status on the Versions pop-up.

Steps:
1. Go to an existing Landing Page (e.g. Home in demo).
2. Make sure there are at least two versions.
Side: In fact if there was only one version error occurs in UI already when publishing second version (however the error does not occur when saving draft versoin).
3. Reload page if the above error occurred.
4. Open Versions pop-up.
5. Try sorting by Status.
Actual: Table is not being sorted, error occurs in console "Uncaught TypeError: model.get(...).toLowerCase is not a function"
Expected: Table is sorted w/o errors.

Remarks: Please see attached.