[CalDAV] Claim error when user name is missing for authentication
[CalDAV] Claim error when user name is missing for authentication

The missing user name could cause repeated tries to authenticate
to the server, which was only a ping to the server, returned
auth-required and the connection close, because of no user name,
even the password could be provided.

tintou/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,matzipan/evolution-data-server,tintou/evolution-data-server