Check for end-of-battle after opening spells are cast, fixes potentially

infinite battle

server/CGameHandler.cpp

@@ -6642,6 +6642,8 @@ void CGameHandler::runBattle()
 			}
 		}
 	}
+	// it is possible that due to opening spells one side was eliminated -> check for end of battle
+	checkBattleStateChanges();
 
 	bool firstRound = true;//FIXME: why first round is -1?