fix

app/types/Respone.py

@@ -23,13 +23,14 @@ class DialogflowResponse(BaseModel):
     fulfillment_response: FulfillmentResponse
     sessionInfo: Optional[SessionInfo] = None
 
-def DialogFlowResponseAPI(text: List[str], payload: Optional[Dict[str, Any]] = None, parameters: Optional[Dict[str, Any]] = None):
+def DialogFlowResponseAPI(text: List[str] = None, payload: Optional[Dict[str, Any]] = None, parameters: Optional[Dict[str, Any]] = None):
     """
     Hàm tạo JSON response cho Dialogflow CX, hỗ trợ payload tùy chỉnh.
     """
 
     messages = []
-    messages.append(Message(text=MessageText(text=text)))
+    if text:
+        messages.append(Message(text=MessageText(text=text)))
     
     if payload:
         messages.append(Message(payload=payload))