support case without version button

Author: tvatavuk

docs-src/templates/shared-global/src/scripts/versions.ts

@@ -2,6 +2,10 @@ import packageJson from '../../../../package.json';
 
 export function setVersionButtonLink() {
   const versionSelector = document.getElementsByClassName('version-button')[0] as HTMLAnchorElement;
+  if (!versionSelector) { 
+    console.log('Version button not found');
+    return; 
+  }
   var oldLink = versionSelector.href;
   var newLink = oldLink + '?version=' + packageJson.version + '&path=' + window.location.pathname;
   versionSelector.setAttribute('href', newLink);