From 38d1126cbcbd8c68c051f19b35cd9647381bd1a1 Mon Sep 17 00:00:00 2001
From: Daniel Roy Greenfeld <pydanny@gmail.com>
Date: Tue, 29 Sep 2015 10:34:37 -0700
Subject: [PATCH] Correct attrs handling

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

diff --git a/markdownx/widgets.py b/markdownx/widgets.py
index 907f953..872b2c4 100755
--- a/markdownx/widgets.py
+++ b/markdownx/widgets.py
@@ -9,7 +9,9 @@ from .settings import MARKDOWNX_EDITOR_RESIZABLE
 class MarkdownxWidget(forms.Textarea):
 
     def render(self, name, value, attrs=None):
-        if 'class' in attrs.keys():
+        if attrs is None:
+            attrs = {}
+        elif 'class' in attrs:
             attrs['class'] += ' markdownx-editor'
         else:
             attrs.update({'class':'markdownx-editor'})