Only limit on contestproblems when there is a current contest

Author: vmcj

webapp/src/Service/DOMJudgeService.php

@@ -427,10 +427,13 @@ public function getUpdates(): array
                 ->leftJoin('s.problem', 'p')
                 ->leftJoin('s.contest', 'co')
                 ->leftJoin('s.team', 't')
-                ->andWhere('b.done = 0')
-                ->leftJoin('p.contest_problems', 'cp', Join::WITH, 'co.cid = cp.contest AND p.probid = cp.problem')
-                ->andWhere('co.cid = :cid')
-                ->setParameter('cid', $contest->getCid());
+                ->andWhere('b.done = 0');
+
+            if ($contest) {
+                $balloonsQuery->leftJoin('p.contest_problems', 'cp', Join::WITH, 'co.cid = cp.contest AND p.probid = cp.problem')
+                              ->andWhere('co.cid = :cid')
+                              ->setParameter('cid', $contest->getCid());
+            }
 
             $freezetime = $contest->getFreezeTime();
             if ($freezetime !== null && !(bool)$this->config->get('show_balloons_postfreeze')) {