Fix issue with SNS subscription checking

Author: mbertrand

dj_elastictranscoder/views.py

@@ -24,7 +24,7 @@ def endpoint(request):
 
 
     # handle SNS subscription
-    if data['Type'] == 'SubscriptionConfirmation':
+    if 'Type' in data and data['Type'] == 'SubscriptionConfirmation':
         subscribe_url = data['SubscribeURL']
         subscribe_body = """
         Please visit this URL below to confirm your subscription with SNS