[FIX] When filter identifier is 0, i.e. root category, it breaks and nothing gets returned, e.g. wiki pages show no categories list anymore. Also in general if you can't identify the filter it is going to lead to weird results.
[FIX] When filter identifier is 0, i.e. root category, it breaks and nothing gets returned, e.g. wiki pages show no categories list anymore. Also in general if you can't identify the filter it is going to lead to weird results.

git-svn-id: a7fabbc6a7c54ea5c67cbd16bd322330fd10cc35@37063 b456876b-0849-0410-b77d-98878d47e9d5

oregional/tiki,tikiorg/tiki,changi67/tiki,oregional/tiki,changi67/tiki,changi67/tiki,tikiorg/tiki,tikiorg/tiki,changi67/tiki,oregional/tiki,changi67/tiki,tikiorg/tiki,oregional/tiki