[Freeciv-Dev] segfault fix

[Thue <thue@xxxxxxx>]

When toggling an AI player assess_danger() is called. The bad thing is that 
it is also called before the game has started and the map move costs are 
initialized, and that it among other things creates lots of warmaps working 
on the map. And so it segfaults. It doesn't do so in 1.11.4, and I am not 
sure why it does it now; it assess_danger()ed in 1.11.4 too.

If anyone care this one took me some time to track down because I assumed the 
error was in new code... :(

-Thue

argh.diff
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