fix: fix null reference error in Safari/Edge (#618)

fixes #617

routes/_store/observers/notificationPermissionObservers.js

@@ -1,5 +1,5 @@
 export function notificationPermissionObservers (store) {
-  if (!process.browser) {
+  if (!process.browser || !navigator.permissions || !navigator.permissions.query) {
     return
   }