fix: not invoke on_llm_response hook when LLM request has error (#3871)

* fix: handle on_agent_done in error responses

- Introduced an LLMResponse for error messages to be processed by agent hooks, ensuring better error reporting and handling.

* fix: improve error logging in on_agent_done hook

---------

Co-authored-by: Soulter <37870767+Soulter@users.noreply.github.com>

astrbot/core/astr_agent_run_util.py

@@ -9,6 +9,7 @@ from astrbot.core.message.message_event_result import (
     MessageEventResult,
     ResultContentType,
 )
+from astrbot.core.provider.entities import LLMResponse
 
 AgentRunner = ToolLoopAgentRunner[AstrAgentContext]
 
@@ -72,7 +73,20 @@ async def run_agent(
 
         except Exception as e:
             logger.error(traceback.format_exc())
+
             err_msg = f"\n\nAstrBot 请求失败。\n错误类型: {type(e).__name__}\n错误信息: {e!s}\n\n请在平台日志查看和分享错误详情。\n"
+
+            error_llm_response = LLMResponse(
+                role="err",
+                completion_text=err_msg,
+            )
+            try:
+                await agent_runner.agent_hooks.on_agent_done(
+                    agent_runner.run_context, error_llm_response
+                )
+            except Exception:
+                logger.exception("Error in on_agent_done hook")
+
             if agent_runner.streaming:
                 yield MessageChain().message(err_msg)
             else: