[FIX] Userslib->get_members to work for empty group filter too
[FIX] Userslib->get_members to work for empty group filter too

git-svn-id: a7fabbc6a7c54ea5c67cbd16bd322330fd10cc35@61548 b456876b-0849-0410-b77d-98878d47e9d5

oregional/tiki,tikiorg/tiki,tikiorg/tiki,tikiorg/tiki,oregional/tiki,oregional/tiki,oregional/tiki,tikiorg/tiki