FIX: improves durability display check

app/assets/javascripts/admin/controllers/admin-dashboard-next.js.es6

@@ -15,8 +15,12 @@ export default Ember.Controller.extend({
   exceptionController: Ember.inject.controller("exception"),
   showVersionChecks: setting("version_checks"),
   diskSpace: Ember.computed.alias("model.attributes.disk_space"),
+  lastBackupTakenAt: Ember.computed.alias(
+    "model.attributes.last_backup_taken_at"
+  ),
   logSearchQueriesEnabled: setting("log_search_queries"),
   availablePeriods: ["yearly", "quarterly", "monthly", "weekly"],
+  shouldDisplayDurability: Ember.computed.and("lastBackupTakenAt", "diskSpace"),
 
   @computed("problems.length")
   foundProblems(problemsLength) {
@@ -137,7 +141,7 @@ export default Ember.Controller.extend({
     return moment(updatedAt).format("LLL");
   },
 
-  @computed("model.attributes.last_backup_taken_at")
+  @computed("lastBackupTakenAt")
   backupTimestamp(lastBackupTakenAt) {
     return moment(lastBackupTakenAt).format("LLL");
   },

app/assets/javascripts/admin/templates/dashboard_next.hbs

@@ -90,7 +90,7 @@
     </div>
     {{#conditional-loading-section isLoading=isLoading title=(i18n "admin.dashboard.backups")}}
       <div class="misc">
-        {{#if diskSpace}}
+        {{#if shouldDisplayDurability}}
           <div class="durability">
             {{#if currentUser.admin}}
               <div class="backups">

app/models/admin_dashboard_next_data.rb

@@ -23,11 +23,20 @@ class AdminDashboardNextData
   end
 
   def as_json(_options = nil)
-    @json ||= {
+    @json ||= get_json
+  end
+
+  def get_json
+    json = {
       reports: AdminDashboardNextData.reports(REPORTS),
-      last_backup_taken_at: last_backup_taken_at,
       updated_at: Time.zone.now.as_json
     }
+
+    if SiteSetting.enable_backups
+      json[:last_backup_taken_at] = last_backup_taken_at
+    end
+
+    json
   end
 
   def last_backup_taken_at