[horde] Dav cannot auth to IMP

[Tom Buehlmann]

Hello List!

I finally got 5.1Beta3 working!
I think i found a bug;
Normally i have imp authenticate horde users. If i try to accces any  
DAV-Related content i get a
"Horde_Imap_Client requires a username and password."
(And a really long trace i can post if nessesary)

If i directly authenticate against the IMAP-Server everything seems to  
work as expected.

--Tom