Update app.py

app.py

@@ -31,9 +31,8 @@ def respond(message, history, system_message, max_tokens, temperature, top_p):
         temperature=temperature,
         top_p=top_p,
     ):
-        token = chunk.choices[0].delta.content
-        if token:
-            response += token
+        if chunk.choices and chunk.choices[0].delta.content:
+            response += chunk.choices[0].delta.content
             yield response