add getValue

EventSubscriber/SiteSettingEventSubscriber.php

@@ -81,7 +81,8 @@ class SiteSettingEventSubscriber implements EventSubscriberInterface
 
                     $this->em->persist($entitySetting);
                 } else {
-                    if ($entitySetting->getValue() === null
+                    $methodGetValue = 'get' . ucfirst($setting['field']);
+                    if ($entitySetting->$methodGetValue() === null
                             && isset($setting['default'])
                             && $setting['default'] !== null) {
                         $methodSetValue = 'set' . ucfirst($setting['field']);