fix bug

app.py

@@ -49,11 +49,10 @@ def respond(
     )
 
     for message in completion:
-        print(message)
-        token = message['choices'][0]['delta']['text']
-
-        response += token
-        yield response
+        delta = chunk['choices'][0]['delta']
+        if 'content' in delta:
+            response += token
+            yield response
 
 
 demo = gr.ChatInterface(