ui: add check for decode

packages/ui-default/package.json

@@ -1,6 +1,6 @@
 {
   "name": "@hydrooj/ui-default",
-  "version": "4.5.13",
+  "version": "4.5.14",
   "author": "undefined <i@undefined.moe>",
   "license": "AGPL-3.0",
   "main": "hydro.js",
@@ -115,6 +115,7 @@
     "nunjucks": "^3.2.3",
     "prismjs": "^1.23.0",
     "streamsaver": "^2.0.5",
+    "vite": "^2.1.5",
     "web-streams-polyfill": "^3.0.2",
     "xss": "^1.0.8",
     "yargs": "^16.2.0"

packages/ui-default/pages/problem_detail.page.jsx

@@ -216,6 +216,7 @@ const page = new NamedPage(['problem_detail', 'contest_detail_problem', 'homewor
   async function loadSubjective() {
     try {
       const props = yaml.load(base64.decode(document.getElementsByClassName('section__body typo')[0].innerText));
+      if (!(props instanceof Array)) return;
       $('.outer-loader-container').show();
       const { default: Subjective } = await import('vj/components/subjective-question/index');
       const React = await import('react');