Update app.py

app.py

@@ -271,9 +271,11 @@ def ask(question, history):
           if 'url' in doc.metadata:
               document_links.append(doc.metadata['url'])
     # Format document links as part of the text output
-    document_links_text = "\n".join(document_links)
-    links_text = f"\n\nSources:\n{document_links_text}"
-    return ai_message['answer'] + "\n" + links_text
+    if document_links:
+        document_links_text = "\n".join(document_links)
+        links_text = f"\n\nSources:\n{document_links_text}"
+    else:
+        links_text = "UNTE_ASSISTANTE"
 
 demo = gr.ChatInterface(fn=ask, title="UNTE ChatBot",theme=gr.themes.Soft())