simplified Form templates as the safeguard is already set in the Form Type

src/Symfony/Bridge/Twig/Resources/views/Form/div_layout.html.twig

@@ -133,7 +133,7 @@
         </div>
     {% else %}
     <select {{ block('attributes') }}{% if multiple %} multiple="multiple"{% endif %}>
-        {% if not multiple and empty_value is not none %}
+        {% if empty_value is not none %}
             <option value="">{{ empty_value|trans }}</option>
         {% endif %}
         {% if preferred_choices|length > 0 %}

src/Symfony/Bundle/FrameworkBundle/Resources/views/Form/choice_widget.html.php

@@ -12,7 +12,7 @@
         <?php if ($read_only): ?> disabled="disabled"<?php endif ?>
         <?php if ($multiple): ?> multiple="multiple"<?php endif ?>
     >
-        <?php if (!$multiple && null !== $empty_value): ?><option value=""><?php echo $view->escape($view['translator']->trans($empty_value)) ?></option><?php endif; ?>
+        <?php if (null !== $empty_value): ?><option value=""><?php echo $view->escape($view['translator']->trans($empty_value)) ?></option><?php endif; ?>
         <?php if (count($preferred_choices) > 0): ?>
             <?php foreach ($preferred_choices as $choice => $label): ?>
                 <?php if ($view['form']->isChoiceGroup($label)): ?>