fix: StaticEventHandler 버그 수정

hwe/sammo/Command/Nation/che_국기변경.php

@@ -137,7 +137,7 @@ class che_국기변경 extends Command\NationCommand
         $logger->pushGlobalHistoryLog("<S><b>【국기변경】</b></><D><b>{$nationName}</b></>{$josaYiNation} <span style='color:{$color};'><b>국기</b></span>를 변경하였습니다.");
 
         $general->increaseInheritancePoint(InheritanceKey::active_action, 1);
-        StaticEventHandler::handleEvent($this->generalObj, $this->destGeneralObj, $this::class, $this->env, $this->arg);
+        StaticEventHandler::handleEvent($this->generalObj, $this->destGeneralObj, $this::class, $this->env, $this->arg ?? []);
         $this->setResultTurn(new LastTurn($this->getName(), $this->arg, 0));
         $general->applyDB($db);
         return true;