perf: 优化在prompt为空的情况下不请求provider

astrbot/core/pipeline/process_stage/method/dify_request.py

@@ -39,7 +39,10 @@ class DifyRequestSubStage(Stage):
                     req.image_urls.append(image_url)
             req.session_id = event.session_id
             event.set_extra("provider_request", req)
-        
+            
+        if not req.prompt:
+            return
+            
         try:
             logger.debug(f"Dify 请求 Payload: {req.__dict__}")
             llm_response = await provider.text_chat(**req.__dict__) # 请求 LLM

astrbot/core/pipeline/process_stage/method/llm_request.py

@@ -44,6 +44,9 @@ class LLMRequestSubStage(Stage):
             session_provider_context = provider.session_memory.get(event.session_id)
             req.contexts = session_provider_context if session_provider_context else []
             
+        if not req.prompt:
+            return
+            
         # 执行请求 LLM 前事件。
         # 装饰 system_prompt 等功能
         handlers = star_handlers_registry.get_handlers_by_event_type(EventType.OnLLMRequestEvent)