Update app.py

app.py

@@ -87,7 +87,10 @@ def get_conversation_chain(vectorstore, model_name):
 
 
 def handle_userinput(user_question):
-    
+
+    if user_question == None:
+        user_question = "привет"
+        
     response = st.session_state.conversation({'question': user_question})
 
     st.session_state.chat_history = response['chat_history']