Bug? Sub op-fire at supplies

[toddtreadway]

I've noticed that subs will opfire at transports that are being used to move supplies (and if the sub hits that supply point is destroyed and the transport is damaged/destroyed), but there is the following problem.

The sub will only fire if it has torpedos. So if you run a destroyer over the sub a few times it will take away the torpedos one by one until the sub runs out. At that point, if you move supplies via a transport in the same space as that sub without torpedos the sub will not perform op-fire. Alternatively, if you were to move another destroyer through the space, the sub would re-supply from an adjacent area and perform op-fire as usual. This re-supply is not done for the movement of supplies by transport. I think it probably should be.