commit 18eb65cb62ff63f422f373fd67cf97504c08e960
Author: Joel Pittet <joel@pittet.ca>
Date:   Sun Jan 5 21:52:29 2014 -0800

    fix whitepsace and call to theme function directly

diff --git a/core/includes/form.inc b/core/includes/form.inc
index 5b88317..f8edfdd 100644
--- a/core/includes/form.inc
+++ b/core/includes/form.inc
@@ -2846,7 +2846,13 @@ function template_preprocess_form_element_label(&$variables) {
   $element = $variables['element'];
 
   // If the element is required, a required marker is appended to the label.
-  $variables['required'] = !empty($element['#required']) ? theme('form_required_marker', array('element' => $element)) : '';
+  $variables['required'] = array();
+  if (!empty($element['#required'])) {
+    $variables['required'] = array(
+      '#theme' => 'form_required_marker',
+      '#element' => $element,
+    );
+  }
   $variables['title'] = (isset($element['#title']) && $element['#title'] !== '') ? Xss::filterAdmin($element['#title']) : '';
 
   $variables['attributes'] = array();
diff --git a/core/modules/system/templates/form-element-label.html.twig b/core/modules/system/templates/form-element-label.html.twig
index bc96254..65e53a1 100644
--- a/core/modules/system/templates/form-element-label.html.twig
+++ b/core/modules/system/templates/form-element-label.html.twig
@@ -14,6 +14,6 @@
  * @ingroup themeable
  */
 #}
-{% if title or required %}
-<label{{ attributes }}>{{ title }}{{ required }}</label>
-{% endif %}
+{% if title is not empty or required -%}
+  <label{{ attributes }}>{{ title }}{{ required }}</label>
+{%- endif %}