Comment 3 for bug 1277194

Thinking about this a little more... implementing a true "this thing does not exist" deleted flag for org units, considering how ubiquitous they are, would be a considerable undertaking. If the only goal is to hide them from a few staff selector widgets, it might make more sense to simply support a "staff_visible" (or similar) field. That way we're not modifying 100 SQL functions.