Update app.py

app.py

@@ -184,9 +184,9 @@ class LangChain_Document_QA:
         message = response.choices[0].text.strip()
         if  ":" in message:
           message = re.sub(r'^.*:', '', message)
-          history[-1][1] = message.strip()
-          history_state.value = history
-          return history
+        history[-1][1] = message.strip()
+        history_state.value = history
+        return history
       except:
         history[-1][1] = "How can I help you?"
         history_state.value = history