Manage Groups selector includes empty rows for groups that user does not have permission for

If you go to Manage Groups when logged in as a user who has permission to only a subset of all groups (based on ACLs) - the selector shows empty rows for the non-permitted groups. You can see this on the sandbox by logging in as:

user = acltest
pw = demo

... and then going to Manage Groups (http://sandbox.civicrm.org/civicrm/group?reset=1)

I think this is side-effect of the partially implemented child group feature. If you look at the $rows array passed to Group/Page/Group.tpl - you'll see that the non-permitted group items are empty EXCEPT for the "children" element. In example below - group 1 is a non-permitted group for this user:

1 => Array (1)
children => empty
4 => Array (12)
id => 4
domain_id => 1
name => Advisory Board
title => Advisory Board
is_active => 1
visibility => Public User Pages and Listings
where_clause => ( `civicrm_group_contact-4`.group_id...
select_tables => a:10:{s:15:"civicrm_contact";i:1;s:15...
where_tables => a:2:{s:15:"civicrm_contact";i:1;s:25:...
group_type => Access Control, Mailing List
action => <a href="http://localhost/dgg/drupal/...
children => empty