commit 613199bc680eec3975c2466a24c517729066062a
Author: Joel Pittet <joel@pittet.ca>
Date:   Tue Jul 8 01:41:15 2014 -0700

    coding standards indent 2 spaces, and no need to init attributes because it's an array.

diff --git a/core/modules/system/templates/menu-tree.html.twig b/core/modules/system/templates/menu-tree.html.twig
index 1d47cd9..5560086 100644
--- a/core/modules/system/templates/menu-tree.html.twig
+++ b/core/modules/system/templates/menu-tree.html.twig
@@ -27,14 +27,14 @@
  */
 #}
 {% if tree -%}
-    {%- if heading -%}
-        {%- if heading.level -%}
-            <{{ heading.level }}{{ heading.attributes }}>{{ heading.text }}</{{ heading.level }}>
-        {%- else -%}
-            <h2{{ heading.attributes }}>{{ heading.text }}</h2>
-        {%- endif -%}
+  {%- if heading -%}
+    {%- if heading.level -%}
+      <{{ heading.level }}{{ heading.attributes }}>{{ heading.text }}</{{ heading.level }}>
+    {%- else -%}
+      <h2{{ heading.attributes }}>{{ heading.text }}</h2>
     {%- endif -%}
-    <ul{{ attributes }}>
-        {{ tree  }}
-    </ul>
+  {%- endif -%}
+  <ul{{ attributes }}>
+    {{ tree  }}
+  </ul>
 {%- endif %}
diff --git a/core/themes/bartik/bartik.theme b/core/themes/bartik/bartik.theme
index 2431c66..47805fc 100644
--- a/core/themes/bartik/bartik.theme
+++ b/core/themes/bartik/bartik.theme
@@ -140,9 +140,6 @@ function bartik_preprocess_block(&$variables) {
  * @see template_preprocess_menu_tree()
  */
 function bartik_preprocess_menu_tree(&$variables) {
-  if (!isset($variables['attributes']['class'])) {
-    $variables['attributes']['class'] = array();
-  }
   $variables['attributes']['class'][] = 'clearfix';
 }