怪话不可为空！！！

konabot/plugins/fortune/__init__.py

@@ -31,7 +31,7 @@ evt_collector = on_message(rule=is_collect_target)
 @evt_collector.handle()
 async def _(msg: UniMsg):
     txt = msg.extract_plain_text()
-    if len(txt) > 50:
+    if len(txt) > 50 or not txt.strip():
         return
     if txt.startswith("说点怪话") or txt.startswith("说些怪话") or txt.startswith("怪话过滤"):
         return