Incoming calls with no call flow are not registered/logged

[matiasgarciaisaia]

In Verboice 3.3.3, with a SIP Client channel that has no call flow assigned but its direction is (mistakenly) Both directions, getting an incoming call raises an exception in the broker and doesn't log the call in the app.

We would expect a CallLog to be created with the call's failure information - but the incoming call isn't logged at all (except for the message logs in the broker's std{out/err}).