Refactor init_leaderboard function to handle multiple subsets and improve column selection and hiding

app.py

@@ -69,9 +69,6 @@ LEADERBOARD_DF, SUBSETS = get_leaderboard_df(RESULTS_REPO)
 
 
 def init_leaderboard(dataframes, subsets):
-    if dataframes is None or not dataframes:
-        raise ValueError("Leaderboard data is empty or None.")
-    
     selected_subset = gr.Dropdown(choices=subsets, label="Select Dataset Subset", value=subsets[0])
     
     return Leaderboard(