Filter when Private doesn't work as expected

Issue Summary

If you enable the Private node module, and this module, and set the filter to private there is an error in the implementation. When you create a book page, and set it to private, and then attempt to add a child to this page, you won't be able to add the page because none of the private nodes will show up. What I need to do is find out which private pages the current user has created, and then if any of these exist, don't exclude them from the list.