Steps to reproduce:

1. Go to Users->Authentication->LDAP settings.
2. Add LDAP server.
3. Go to Users->User groups
4. Create user group with Frontend access LDAP, but leave LDAP server as default.
5. Go back to Users->Authentication->LDAP settings.
6. Observe list of LDAP servers.

Result:
User groups column shows 0 user groups.

Expected:
User groups column should show the correct number of user groups, including groups that use default LDAP server. In this case 1.

Problem occurs in CUserdirectory()->addRelatedUserGroups() function, that does not take into account user groups, which have default LDAP server.