From cc998cceb5bb35658f811c3426217cde54e9952d Mon Sep 17 00:00:00 2001
From: Carl Meyer <carl@oddbird.net>
Date: Sun, 29 Dec 2013 23:53:30 -0600
Subject: [PATCH] Make 'class' option to wrap directive optional.

---
 modules/wrap.py | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/modules/wrap.py b/modules/wrap.py
index 224b39f..08b3453 100644
--- a/modules/wrap.py
+++ b/modules/wrap.py
@@ -57,7 +57,9 @@ def run(self):
         element_id = self.options.get('id', None)
         if element_id is not None:
             node['ids'].append(element_id)
-        node['classes'].extend(self.options['class'])
+        cls = self.options.get('class')
+        if cls:
+            node['classes'].extend(cls)
         self.add_name(node)
         self.state.nested_parse(self.content, self.content_offset, node)
         return [node]