fix: exclude system chats from topic group processing

Prevents the channel from attempting to process topic groups for system chats,
which could lead to unexpected behavior since system chats are not meant to
be linked to topics.

Author: jiz4oh

efb_telegram_master/slave_message.py

@@ -265,7 +265,7 @@ def get_slave_msg_dest(self, msg: Message) -> Tuple[str, Tuple[Optional[Telegram
 
         if tg_chat:  # if this chat is linked
             tg_dest = TelegramChatID(int(utils.chat_id_str_to_id(tg_chat)[1]))
-        elif self.channel.topic_group:
+        elif not isinstance(chat, SystemChat) and self.channel.topic_group:
             thread_id = self.db.get_topic_thread_id(slave_uid=chat_uid, topic_chat_id=self.channel.topic_group)
             if thread_id:
                 try: