This is a bit of a hack that makes the TGPs fall back to AIM-120s. It
works okay because this only applies to a few cases:
The A-10 gets an empty pylon. That's fine. Maybe later we can add
multiple fallback paths and depth-first-search through them so that that
pylon could carry bombs instead.
The Viper has no replacemnt for that station. The jammer goes on the
other fuselage station, the HTS isn't a replacement, and we don't have
LANTIRN for the Viper. No weapons can be fit to those stations.
What this helps is the Hornet, where any Gulf War scenario ends up with
an empty cheek station because we don't have the NITE HAWK to fall back
to. In this case we can instead fall back through the air-to-air
missiles to fill the station.