fix nickname

README.md

@@ -246,6 +246,7 @@ __Docker 最新版本由 [Sakuracio](https://github.com/Sakuracio) 提供__
 ### 2022/6/18
 
 * 修复webui中plugins2setting修改时会改变plugins2setting.cmd为字符串
+* 修复昵称系统`BLACK_WORD`为空时造成报错
 * 优化webUI，当有插件出错时不会影响其他插件显示
 * 优化browser
 

basic_plugins/nickname.py

@@ -63,8 +63,9 @@ async def _(bot: Bot, event: MessageEvent, arg: Message = CommandArg()):
         await nickname.finish("笨蛋！休想占用我的名字！#", at_sender=True)
     _tmp = ""
     black_word = Config.get_config("nickname", "BLACK_WORD")
-    for x in msg:
-        _tmp += "*" if x in black_word else x
+    if black_word:
+        for x in msg:
+            _tmp += "*" if x in black_word else x
     msg = _tmp
     if isinstance(event, GroupMessageEvent):
         if await GroupInfoUser.set_group_member_nickname(