Stop brief page table of contents throwing error on other pages

js/src/collaborations/eclipsefdn.rollover-link.js

@@ -53,6 +53,8 @@ const isMobile = () => {
 (async function EclipseFdnRolloverLink() {
     const elements = document.querySelectorAll('.eclipsefdn-rollover-link');
 
+    if (elements.length === 0) return;
+
     elements.forEach(element => {
         const options = {
             hashId: element.dataset.hashId