Improve player frame filtering in app.py by dropping rows without position data

- Added logic to drop rows from the player frame where the 'Pos' column is NaN, ensuring only relevant player data is displayed.
- This enhancement refines the filtering process based on user-selected positions, further improving data clarity and user experience.

app.py

@@ -219,10 +219,12 @@ with tab2:
                         pos_select = None
 
                 if entry_parse_var == 'All':
+
                     st.session_state['player_frame'] = create_player_exposures(working_df, player_columns)
                     hold_frame = st.session_state['player_frame'].copy()
                     hold_frame['Pos'] = hold_frame['Player'].map(map_dict['pos_map'])
                     st.session_state['player_frame'].insert(1, 'Pos', hold_frame['Pos'])
+                    st.session_state['player_frame'] = st.session_state['player_frame'].dropna(subset=['Pos'])
                     if pos_select:
                         position_mask = st.session_state['player_frame']['Pos'].apply(lambda x: any(pos in x for pos in pos_select))
                         st.session_state['player_frame'] = st.session_state['player_frame'][position_mask]
@@ -232,10 +234,12 @@ with tab2:
                         format(formatter='{:.2%}', subset=st.session_state['player_frame'].iloc[:, 2:].select_dtypes(include=['number']).columns),
                         hide_index=True)
                 else:
+                    
                     st.session_state['player_frame'] = create_player_exposures(working_df, player_columns, entry_names)
                     hold_frame = st.session_state['player_frame'].copy()
                     hold_frame['Pos'] = hold_frame['Player'].map(map_dict['pos_map'])
                     st.session_state['player_frame'].insert(1, 'Pos', hold_frame['Pos'])
+                    st.session_state['player_frame'] = st.session_state['player_frame'].dropna(subset=['Pos'])
                     if pos_select:
                         position_mask = st.session_state['player_frame']['Pos'].apply(lambda x: any(pos in x for pos in pos_select))
                         st.session_state['player_frame'] = st.session_state['player_frame'][position_mask]