none type error fixed

app.py

@@ -7,6 +7,39 @@ For more information on `huggingface_hub` Inference API support, please check th
 client = InferenceClient("meta-llama/Meta-Llama-3-8B-Instruct")
 
 
+# def respond(
+#     message,
+#     history: list[tuple[str, str]],
+#     system_message,
+#     max_tokens,
+#     temperature,
+#     top_p,
+# ):
+#     messages = [{"role": "system", "content": system_message}]
+
+#     for val in history:
+#         if val[0]:
+#             messages.append({"role": "user", "content": val[0]})
+#         if val[1]:
+#             messages.append({"role": "assistant", "content": val[1]})
+
+#     messages.append({"role": "user", "content": message})
+
+#     response = ""
+
+#     for message in client.chat_completion(
+#         messages,
+#         max_tokens=max_tokens,
+#         stream=True,
+#         temperature=temperature,
+#         top_p=top_p,
+#     ):
+#         token = message.choices[0].delta.content
+
+#         response += token
+#         yield response
+
+##None type 
 def respond(
     message,
     history: list[tuple[str, str]],
@@ -34,10 +67,11 @@ def respond(
         temperature=temperature,
         top_p=top_p,
     ):
-        token = message.choices[0].delta.content
+        if message.choices[0].delta.content is not None:
+            token = message.choices[0].delta.content
+            response += token
 
-        response += token
-        yield response
+    yield response
 
 """
 For information on how to customize the ChatInterface, peruse the gradio docs: https://www.gradio.app/docs/chatinterface