4.13.2 de-bugging

[western0221]

Not only 4.13.2m , at least 4.12.2m had the same bug.

When we play a single mission (or a quick mission) and a carrier ship is heavily damaged , sinks .... dies,
NullPointerException happens and fps drops about 3 - 5 secs in Die() method.
Game doesn't crash and we can continue our flight after that exception.