fix: 이민족 발동 시, 초기 이성이 없으면 동작하지 않도록

hwe/sammo/Event/Action/RaiseInvader.php

@@ -93,8 +93,6 @@ class RaiseInvader extends \sammo\Event\Action
     public function run(array $env)
     {
         $db = DB::db();
-        $gameStor = KVStorage::getStorage($db, 'game_env');
-        $gameStor->setValue('isunited', 1);
 
         $npcEachCount = $this->npcEachCount;
 
@@ -107,6 +105,13 @@ class RaiseInvader extends \sammo\Event\Action
             $cities[] = $cityObj;
         }
 
+        if(!$cities){
+            return [__CLASS__, 0];
+        }
+
+        $gameStor = KVStorage::getStorage($db, 'game_env');
+        $gameStor->setValue('isunited', 1);
+
         if ($npcEachCount < 0) {
             $npcEachCount =
                 $db->queryFirstField('SELECT count(no) from general where npc < 4') / count($cities);