[Freeciv-Dev] Server stops after Trireme attack (PR#397)

[Christian Knoke <ChrisK@xxxxxxxx>]

Version: 1.10.2 BETA compiled from source
System:  Linux i386 2.2.13

2 human players having embassies, having peace
first tries to attack second:
1. Tririme vs. empty city: says: no war with <second> - can't conquer
city 
  [retranslated]
2. same move, Trireme vs. Legion: Server STOPS, saying:

> 1: Warning: malloc with size 0 at line 265 of diplodlg.c

  [this message is some rounds before the next]

0: Trying to attack a unit with which you have peace or cease-fire at
75, 41
1: lost connection to server

I was able to reproduce this a second time.

HTH,
Chris