[FIX] Handle threshold -1 to always display the search controls

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52032 b456876b-0849-0410-b77d-98878d47e9d5
[FIX] Group filter would not work with group names containing spaces

git-svn-id: file:///var/local/code.tiki.org/tikisvn/trunk@52033 b456876b-0849-0410-b77d-98878d47e9d5