fix php 5.4 compatibility

library/Class/CustomField/Value.php

@@ -69,7 +69,7 @@ class Class_CustomField_Value extends Storm_Model_Abstract {
 
 
   public function getSelectedOptionsList() {
-    if (empty($this->getOptionsListAsArray()))
+    if (!$this->getOptionsListAsArray())
       return [];
 
     return explode(';', $this->getValue());