In EnsureChannel, check pending call channels as well.
In EnsureChannel, check pending call channels as well.

If there's a pending call channel, the EnsureChannel request can
piggy-back on that request and simply add its request_token to the
list in the MediaChannelRequest.

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