Fix JS error on pull request page (#30838) (#30841)

Backport #30838 by silverwind

Fix this error seen on PR page, regression from
https://github.com/go-gitea/gitea/pull/30803:

Co-authored-by: silverwind <me@silverwind.io>
Co-authored-by: wxiaoguang <wxiaoguang@gmail.com>

diff --git a/web_src/js/features/repo-legacy.js b/web_src/js/features/repo-legacy.js
index 670e60def03b49be5a4e1a1f430bf3623f836dc0..b65938b045ac605b551c44de5b857f31fce56d44 100644 (file)
--- a/web_src/js/features/repo-legacy.js
+++ b/web_src/js/features/repo-legacy.js
@@ -57,6 +57,7 @@ export function initRepoCommentForm() {
 
   function initBranchSelector() {
     const elSelectBranch = document.querySelector('.ui.dropdown.select-branch');
+    if (!elSelectBranch) return;
     const isForNewIssue = elSelectBranch.getAttribute('data-for-new-issue') === 'true';
 
     const $selectBranch = $(elSelectBranch);