fixed response

app.py

@@ -551,7 +551,7 @@ if __name__ == '__main__':
                 #    token = f"\n{token}"
                 #if re.match(r"^[1-9]\.",token.choices[0].delta.content):
                 #    token = f"\n{token}"
-                if token.choices[0].delta.content != "":
+                if token.choices != None:
                     history[-1]['content'] += token.choices[0].delta.content
                     yield history, image_gallery
             end = time.time()