Problem while create private & invisible groups

[madloki]

I can not create new topics for private oder invisible groups. Or, he creates the topics but listen only when the group has right 1 (open), private and invisible doesn't show the topic in the forum directory ans shows always ("cannot create topic........" blabla).

[DJPaul]

See http://buddypress.org/forums/topic/private-groups-and-forum?replies=6#post-25031

[apeatling]

(In [2026]) Fixes #1149