Test Server property on search channels requested without one.
Test Server property on search channels requested without one.

If you request a ContactSearch channel without including a Server
property in the request, and Gabble has discovered a server it could
use, the resulting channel's Server property should be set to the server
in use.

This already works, but previously wasn't tested.

Ziemin/telepathy-gabble,jku/telepathy-gabble,jku/telepathy-gabble,mlundblad/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,Ziemin/telepathy-gabble,jku/telepathy-gabble,mlundblad/telepathy-gabble,mlundblad/telepathy-gabble