fixed template

app.py

@@ -43,7 +43,7 @@ def bot(history):
     documents = faiss_index.similarity_search(retrieve_query) if retrieve_query else ''
     user_prompt = USER_PROMPT(user_query, documents)
 
-    prompt_html = template_html.render(documents=documents, query=user_query)
+    prompt_html = template_html.render(documents=documents, query=retrieve_query if retrieve_query else 'No query')
     stream = chat.stream(user_prompt)
 
     history[-1][1] = ""