fix: Prevent AutoGPT crashes when LLM does not use a command

- Updated `agent.py` to check if `command_name` exists before registering an action in `event_history`.
- Updated `agent_protocol_server.py` to handle the scenario when `execute_command` is not provided by LLM.
- Updated `main.py` to check if `command_name` exists before executing the command and logging the result.

autogpts/autogpt/autogpt/agents/agent.py

@@ -187,13 +187,14 @@ class Agent(
             NEXT_ACTION_FILE_NAME,
         )
 
-        self.event_history.register_action(
-            Action(
-                name=command_name,
-                args=arguments,
-                reasoning=assistant_reply_dict["thoughts"]["reasoning"],
+        if command_name:
+            self.event_history.register_action(
+                Action(
+                    name=command_name,
+                    args=arguments,
+                    reasoning=assistant_reply_dict["thoughts"]["reasoning"],
+                )
             )
-        )
 
         return command_name, arguments, assistant_reply_dict
 

autogpts/autogpt/autogpt/app/agent_protocol_server.py

@@ -226,6 +226,8 @@ class AgentProtocolServer:
             if execute_command == ask_user.__name__:  # HACK
                 execute_result = ActionSuccessResult(outputs=user_input)
                 agent.event_history.register_result(execute_result)
+            elif not execute_command:
+                execute_result = None
             elif execute_approved:
                 step = await self.db.update_step(
                     task_id=task_id,

autogpts/autogpt/autogpt/app/main.py

@@ -556,14 +556,17 @@ async def run_interaction_loop(
 
         handle_stop_signal()
 
-        result = await agent.execute(command_name, command_args, user_input)
+        if command_name:
+            result = await agent.execute(command_name, command_args, user_input)
 
-        if result.status == "success":
-            logger.info(result, extra={"title": "SYSTEM:", "title_color": Fore.YELLOW})
-        elif result.status == "error":
-            logger.warn(
-                f"Command {command_name} returned an error: {result.error or result.reason}"
-            )
+            if result.status == "success":
+                logger.info(
+                    result, extra={"title": "SYSTEM:", "title_color": Fore.YELLOW}
+                )
+            elif result.status == "error":
+                logger.warn(
+                    f"Command {command_name} returned an error: {result.error or result.reason}"
+                )
 
 
 def update_user(