fix(core): Fix undefined "application" array key error

Signed-off-by: Christopher Ng <[email protected]>

Author: Pytal

core/templates/layout.public.php

@@ -10,7 +10,7 @@
 	<meta charset="utf-8">
 	<title>
 	<?php
-				p(!empty($_['pageTitle']) && $_['pageTitle'] !== $_['application'] ? $_['pageTitle'] . ' - ' : '');
+				p(!empty($_['pageTitle']) && (empty($_['application']) || $_['pageTitle'] !== $_['application']) ? $_['pageTitle'] . ' - ' : '');
 p(!empty($_['application']) ? $_['application'] . ' - ' : '');
 p($theme->getTitle());
 ?>