Add Back the query checking

app.py

@@ -80,7 +80,7 @@ def answer_question(query):
                                          prompt=PROMPT, 
                                          verbose=True, 
                                          return_intermediate_steps=True,
-                                        #  use_query_checker=True
+                                         use_query_checker=True
                                          )
     result = db_chain(q)
     return result['result']