added null defaul;ts

app.py

@@ -140,26 +140,25 @@ with st.sidebar:
     tes = dk_roo_main[dk_roo_main['Position'] == 'TE']['Player'].unique()
     flex = dk_roo_main['Player'].unique()
     # Create multiselect dropdowns for each position
-    selected_qbs = st.selectbox('Select QB:', qbs, key='qb1')
+    selected_qbs = st.selectbox('Select QB:', qbs, index=None, key='qb1')
     if selected_qbs:
         qb_team = dk_roo_main[dk_roo_main['Player'] == selected_qbs]['Team'].iloc[0]
         qb_teammates = dk_roo_main[dk_roo_main['Team'] == qb_team]
         suggest_wr = qb_teammates[qb_teammates['Position'] == 'WR']['Player'].iloc[0]
         suggest_te = qb_teammates[qb_teammates['Position'] == 'TE']['Player'].iloc[0]
-    selected_rb1 = st.selectbox('Select RB1:', rbs, key='rb1')
-    selected_rb2 = st.selectbox('Select RB2:', rbs, key='rb2')
+    selected_rb1 = st.selectbox('Select RB1:', rbs, index=None, key='rb1')
+    selected_rb2 = st.selectbox('Select RB2:', rbs, index=None, key='rb2')
     if selected_qbs:
         selected_wr1 = st.selectbox('Select WR1:', wrs, placeholder=suggest_wr, key='wr1')
     else:
-        selected_wr1 = st.selectbox('Select WR1:', wrs, key='wr1')
-    selected_wr2 = st.selectbox('Select WR2:', wrs, key='wr2')
-    selected_wr3 = st.selectbox('Select WR3:', wrs, key='wr3')
-    selected_te = st.selectbox('Select TE:', tes, key='te')
+        selected_wr1 = st.selectbox('Select WR1:', wrs, index=None, key='wr1')
+    selected_wr2 = st.selectbox('Select WR2:', wrs, index=None, key='wr2')
+    selected_wr3 = st.selectbox('Select WR3:', wrs, index=None, key='wr3')
     if selected_qbs:
         selected_te = st.selectbox('Select TE:', tes, placeholder=suggest_te, key='te')
     else:
-        selected_te = st.selectbox('Select TE:', tes, key='te')
-    selected_flex = st.selectbox('Select Flex:', flex, key='flex')
+        selected_te = st.selectbox('Select TE:', tes, index=None, key='te')
+    selected_flex = st.selectbox('Select Flex:', flex, index=None, key='flex')
 
     # Combine all selected players
     all_selected = selected_qbs + selected_rb1 + selected_rb2 + selected_wr1 + selected_wr2 + selected_wr3 + selected_te + selected_flex