Citadel import fails

[Ebag333]

Looks like when we hit like 312 of port.py we end up getting None for fit.ship

        try:
            ship = sMkt.getItem(shipType)
            fit.ship = Ship(ship)
            fit.name = fitName
        except:
            return

Playing around a little with this in #744

[blitzmann]

Yeah, it's because we used to assume everything is a ship. You can fix this with a try / catch, like how we do when creating a new ship:

https://github.com/pyfa-org/Pyfa/blob/master/service/fit.py#L161

Also, for pull requests, try to limit one request per issue if possible. Lumping multiple things together gets hairy ;)