fix：修复表达器炸裂

src/chat/express/exprssion_learner.py

@@ -83,8 +83,13 @@ class ExpressionLearner:
 
         # 获取当前chat_id的类型
         chat_stream = get_chat_manager().get_stream(chat_id)
+        if chat_stream is None:
+            # 如果聊天流不在内存中，跳过互通组查找，直接使用当前chat_id
+            logger.warning(f"聊天流 {chat_id} 不在内存中，跳过互通组查找")
+            chat_ids_to_load = [chat_id]
+        else:
             platform = chat_stream.platform
-        if chat_stream and chat_stream.group_info:
+            if chat_stream.group_info:
                 current_chat_type = "group"
                 typed_chat_id = f"{platform}:{chat_stream.group_info.group_id}:{current_chat_type}"
             else:
@@ -266,7 +271,10 @@ class ExpressionLearner:
         learnt_expressions, chat_id = res
 
         chat_stream = get_chat_manager().get_stream(chat_id)
-        if chat_stream.group_info:
+        if chat_stream is None:
+            # 如果聊天流不在内存中，使用chat_id作为默认名称
+            group_name = f"聊天流 {chat_id}"
+        elif chat_stream.group_info:
             group_name = chat_stream.group_info.group_name
         else:
             group_name = f"{chat_stream.user_info.user_nickname}的私聊"