Merge branch...

Merge branch '14666-error-from-javascripts-prometheus_alerts-index-js-on-integrations-settings-pages' into 'master'

Resolve "Error from javascripts/prometheus_alerts/index.js on Integrations Settings pages"

Closes #14666

See merge request gitlab-org/gitlab-ee!15973

ee/app/assets/javascripts/prometheus_alerts/index.js

@@ -4,6 +4,10 @@ import ResetKey from './components/reset_key.vue';
 export default () => {
   const el = document.querySelector('#js-settings-prometheus-alerts');
 
+  if (!el) {
+    return;
+  }
+
   const { authorizationKey, changeKeyUrl, notifyUrl, learnMoreUrl } = el.dataset;
 
   // eslint-disable-next-line no-new