fix(pipeline): skip waking on empty messages (#6893)

* fix(pipeline): skip waking on empty messages

* fix(pipeline): skip empty message LLM request even with provider_request

* fix(pipeline): skip empty messages in empty_mention_waiter

astrbot/builtin_stars/session_controller/main.py

@@ -91,6 +91,8 @@ class Main(Star):
                         controller: SessionController,
                         event: AstrMessageEvent,
                     ) -> None:
+                        if not event.message_str or not event.message_str.strip():
+                            return
                         event.message_obj.message.insert(
                             0,
                             Comp.At(qq=event.get_self_id(), name=event.get_self_id()),