Fix assistant reply formatting fallback.

app.py

@@ -126,7 +126,7 @@ Color: ['W']
     if len(new_card_text) > 1:
         new_card_text = new_card_text[1].strip()
     else:
-        new_card_text = new_card_text.split('\n\n')
+        new_card_text = assistant_reply.split('\n\n')
         if len(new_card_text) < 2:
             return assistant_reply, card_text, None
         new_card_text = new_card_text[1].strip()