[Freeciv] server crash

[mail man <sunhater@xxxxxxxxx>]

I am using freeciv-cvs-Nov-25 and it crushes repeatedly at the same mom=
ent of the game (the game is saved only moments before the crush), few =
seconds after presing "Next turn" with server reporting:

> civserver: cityturn.c:237: auto_arrange_workers: P=F8edpoklad `cmr.fo=
und_a_valid' nespln=ECn.
Ne=FAsp=EC=B9n=EC ukon=E8en (SIGABRT)

translated:

> civserver: cityturn.c:237: auto_arrange_workers: Assumption `cmr.foun=
d_a_valid' not fulfilled.
Unsuccessfully terminated (SIGABRT)

I know it's not a stable version, but maybe it might help in developing=
 one.
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