[FIX] Default to bootstrap theme if none added to DB

Author: TheSerapher

include/smarty_globals.inc.php

@@ -225,7 +225,7 @@
   $_SESSION['POPUP'][] = array('CONTENT' => 'You are using an old Theme that will not be maintained in the future.', 'TYPE' => 'alert alert-warning');
 
 // Check we can load the theme at all
-if ( !in_array($setting->getValue('website_theme'), $template->getThemes()))
+if ( !in_array($setting->getValue('website_theme', 'bootstrap'), $template->getThemes()))
   die('Unable to find your selected theme `' . $setting->getValue('website_theme') . '` in the list of available themes. Please reset your `website_theme` setting in your database.');
 
 // So we can display additional info