update server.chat.*: set default value [] to history parameter.

server/chat/chat.py

@@ -13,7 +13,7 @@ from server.chat.utils import History
 
 
 def chat(query: str = Body(..., description="用户输入", example="恼羞成怒"),
-         history: Optional[List[History]] = Body(...,
+         history: List[History] = Body([],
                                     description="历史对话",
                                     example=[
                                         {"role": "user", "content": "我们来玩成语接龙，我先来，生龙活虎"},
@@ -21,7 +21,7 @@ def chat(query: str = Body(..., description="用户输入", example="恼羞成
                                     ),
          ):
     async def chat_iterator(query: str,
-                            history: Optional[List[History]]
+                            history: List[History] = [],
                             ) -> AsyncIterable[str]:
         callback = AsyncIteratorCallbackHandler()
 

server/chat/knowledge_base_chat.py

@@ -19,7 +19,7 @@ import json
 def knowledge_base_chat(query: str = Body(..., description="用户输入", example="你好"),
                         knowledge_base_name: str = Body(..., description="知识库名称", example="samples"),
                         top_k: int = Body(VECTOR_SEARCH_TOP_K, description="匹配向量数"),
-                        history: Optional[List[History]] = Body(...,
+                        history: List[History] = Body([],
                                                     description="历史对话",
                                                     example=[
                                                         {"role": "user",