Modify empty_value check with empty()

Form/Type/TranslatableChoiceType.php

@@ -71,8 +71,8 @@ class TranslatableChoiceType extends ChoiceType
         }
 
         $view->set('choices', $choices);
-
-        if ('' !== $view->get('empty_value') && null !== $view->get('empty_value')) {
+        $empty_value = $view->get('empty_value');
+        if (!empty($empty_value)) {
             $view->set('empty_value', $this->translator->trans($view->get('empty_value'), array(), $catalogue));
         }
     }