Merge pull request #1249 from xinnan-tech/manager-local-mem

fix:short_momery可能为空的bug

Author: xinnan-tech

main/xiaozhi-server/core/providers/memory/mem_local_short/mem_local_short.py

@@ -153,7 +153,7 @@ async def save_memory(self, msgs):
                 msgStr += f"User: {msg.content}\n"
             elif msg.role == "assistant":
                 msgStr += f"Assistant: {msg.content}\n"
-        if len(self.short_momery) > 0:
+        if self.short_momery and len(self.short_momery) > 0:
             msgStr += "历史记忆：\n"
             msgStr += self.short_momery