Fix infinite loop

server.py

@@ -286,6 +286,8 @@ class LeaderboardServer:
             while rest_of_competitors:
                 if len(next_competitors) < 5:  # 5*2==10 tasks
                     next_competitors.append(rest_of_competitors.pop())
+                else:
+                    break
             
             for competitor_id in next_competitors:
                 result_url[competitor_id] = check_significance_send_task(new_model_file, self.submission_id_to_file[competitor_id])