Fix: Improve error resistance for Sentry initializer

We check `sentrySettings.data()['enabled']` to determine whether Sentry should be enabled. By adding an additional safe-guard, we ensure that even pages without a Sentry meta tag don't cause errors in the JavaScript console.

Author: MrSerth

app/assets/javascripts/base.js

@@ -46,7 +46,7 @@ $(document).on('turbo-migration:load', function() {
     const sentrySettings = $('meta[name="sentry"]')
 
     // Workaround for Turbo: We must not re-initialize the Relay object when visiting another page
-    if (sentrySettings && sentrySettings.data()['enabled'] && Sentry.getReplay() === undefined) {
+    if (sentrySettings && sentrySettings.data() && sentrySettings.data()['enabled'] && Sentry.getReplay() === undefined) {
         Sentry.init({
             dsn: sentrySettings.data('dsn'),
             attachStacktrace: true,