Don't remove client's teams from teams list on "ROUNDFINISHED 0", just send team removal message to others. This should fix problems with ghost teams in frontend. Not tested at all, successfully built on first attempt, which is considered as a bad sign :D Server still thinks game proceeds, so restart isn't possible.

Hedgewars - a turn based strategy game.
Distributed under the terms of the GNU GPL licence.
Images and sounds are distributed under the terms of the GNU FDL licence.

Source:
Copyright 2004-2011 Andrey Korotaev <unC0Rr@gmail.com>
Portions copyright 2006-2008 Igor Ulyanov aka Displacer <iulyanov@gmail.com>