Update app.py

app.py

@@ -249,6 +249,8 @@ def generate_leaderboard(file_path):
         reader = csv.reader(csvfile, delimiter=',')
         header = next(reader)
         for row in reader:
+            if not row:  # skip empty rows
+                continue
             user = row[2]  # use index 2 for the 'Who' column
             if user in leaderboard:
                 leaderboard[user] += 1