Add default handling for 'Ignore Specific Stacks' in 'Manage Portfolio', ensuring an empty list is set when no stacks are selected, improving user experience and preventing errors.

app.py

@@ -1589,6 +1589,8 @@ if selected_tab == 'Manage Portfolio':
                     exposure_target = st.number_input("Target Exposure", value=.50, min_value=0.0, max_value=1.0, step=0.01)
                     if 'Stack' in st.session_state['working_frame'].columns:
                         ignore_stacks = st.multiselect("Ignore Specific Stacks?", options=sorted(list(set(st.session_state['projections_df']['team'].unique()))), default=[])
+                    else:
+                        ignore_stacks = []
                     remove_teams_exposure = st.multiselect("Removed/Locked teams?", options=sorted(list(set(st.session_state['projections_df']['team'].unique()))), default=[])
                     specific_replacements = st.multiselect("Specific Replacements?", options=sorted(list(set(st.session_state['projections_df']['player_names'].unique()))), default=[])
                     submitted_col, export_col = st.columns(2)