录播助手更新：避免因为未开播而导致出现错误提示

liveDownloader.py

@@ -23,6 +23,7 @@ class downloader(XiGuaLiveApi):
         self.updPlayList()
 
     def updPlayList(self):
+        if api.isLive:
             if "stream_url" not in self._rawRoomInfo:
                 if self.playlist is None:
                     self.apiChangedError("无法获取直播链接")