Dashboard: show a nice message if no dashboard...

...is available

fixes #13027

application/controllers/DashboardController.php

@@ -25,10 +25,6 @@ class DashboardController extends ActionController
             }
         }
 
-        if (empty($dashboards)) {
-            throw new NotFoundError('Got no "%s" dashboard for you', $name);
-        }
-
         $this->view->dashboards = $dashboards;
     }
 }

application/views/scripts/dashboard/index.phtml

@@ -7,6 +7,9 @@
 <p class="error"><?= $this->errorMessage ?></p>
 <?php endif ?>
 <?= $this->form ?>
+<?php if (empty($this->dashboards)): ?>
+<?= $this->translate('No dashboard available, you might have not enough permissions') ?>
+<?php endif ?>
 <?php foreach ($this->dashboards as $dashboard): ?>
 <h1><?= $this->escape($dashboard->getTitle()) ?></h1>
 <ul class="main-actions" data-base-target="_next">