Update app.py

app.py

@@ -129,6 +129,10 @@ def initialize_session_state():
         st.session_state.vector_stores = {}
     if 'selected_collection' not in st.session_state:
         st.session_state.selected_collection = None
+    if 'show_collection_dialog' not in st.session_state:
+    st.session_state.show_collection_dialog = False
+    if 'selected_collection' not in st.session_state:
+    st.session_state.selected_collection = None
 
 def display_top_bar():
     """Display the application's top navigation bar."""