fix get_session error

bot/session_manager.py

@@ -50,7 +50,7 @@ class SessionManager(object):
         '''
         if session_id not in self.sessions:
             self.sessions[session_id] = self.sessioncls(session_id, system_prompt, **self.session_args)
-        elif system_prompt is not None: # 如果有新的system_prompt，更新并重置session
+        elif system_prompt is not None:  # 如果有新的system_prompt，更新并重置session
             self.sessions[session_id].set_system_prompt(system_prompt)
         session = self.sessions[session_id]
         return session

plugins/tool/tool.py

@@ -76,7 +76,7 @@ class Tool(Plugin):
 
                 # Don't modify bot name
                 all_sessions = Bridge().get_bot("chat").sessions
-                user_session = all_sessions.session_query(query, e_context['context']['session_id'])
+                user_session = all_sessions.session_query(query, e_context['context']['session_id']).messages
 
                 # chatgpt-tool-hub will reply you with many tools
                 logger.debug("[tool]: just-go")