fix bugs - 0819

3) replace "0" with "-" for average column

src/read_evals.py

@@ -222,4 +222,7 @@ def get_leaderboard_df(raw_data: List[FullEvalResult], task: str, metric: str) -
 
     # shorten the revision
     df[COL_NAME_REVISION] = df[COL_NAME_REVISION].str[:6]
+    
+    # replace "0" with "-" for average score
+    df[COL_NAME_AVG] = df[COL_NAME_AVG].replace(0, "-")
     return df