Fix last commit

app.py

@@ -158,10 +158,15 @@ def fetch_model_detail(submission_id):
     )
 
 def fetch_model_tournament_results_table(submission_id, category):
-    return gr.update(
-        value=leaderboard_server.get_model_tournament_table(submission_id, category),
-        visible=True,
-    )
+    if submission_id == None:
+        return gr.update(
+            visible=False,
+        )
+    else:
+        return gr.update(
+            value=leaderboard_server.get_model_tournament_table(submission_id, category),
+            visible=True,
+        )
 
 def change_leaderboard_category(category, selected_submission_id):
     if category == leaderboard_server.TASKS_CATEGORY_OVERALL: