[leafnode-list] inaccurate response to GROUP command

[Brian Sammon]

> > Okay, but it doesn't do anything if the group is empty.  I subscribe to som 
> > groups that are currently empty and I'd like it to keep them marked 
> > interesting as well.
> 
> That should work, the patch implements refreshing the subscription if list
> active is requested with a single newsgroups. As per your description,
> this should help knews.

Yeah, but if the group is a "pseudogroup", it doesn't.  And apparently, an 
empty group qualifies as a pseudogroup.