[ajrichardson]

Groups are not reverting to tasks if their children are removed. Steps to recreate:

1. Create Task 1
2. Create Task 2 and Tab it under Task 1. Task 1 converts to Group
3. Outdent Task 2 so it comes back to the same level as Task 1
4. Task 1 is still rendered as a Group, even though it now has no children.

Adam