NSElvis/NSManagedObject-ANDYMapChanges — pull request #4 by NSElvis (2014-11-21 10:02:08+00:00)
Title: Handle null in awesome ways

The idea is that if you have an object with `null` `id`s, that object
will get purged.

If you’re trying to create/update/delete an object with a `null` `id`
it will get ignored.