cope with preapproval row being None (bug 712385)

apps/addons/tests/test_views.py

@@ -597,7 +597,6 @@ class TestPaypalStart(PaypalStart):
             shared_url('addons.purchase.thanks', self.addon))
 
 
-
 @patch.object(waffle, 'switch_is_active', lambda x: True)
 @patch.object(settings, 'LOGIN_RATELIMIT_USER', 10)
 @patch('webapps.models.create_receipt', lambda x: 'receipt')

apps/paypal/__init__.py

@@ -116,7 +116,7 @@ def get_paykey(data):
     receivers = (data.get('chains', ()), data['email'], data['amount'],
                  data['uuid'])
 
-    if 'preapproval' in data:
+    if data.get('preapproval'):
         # The paypal_key might be empty if they have removed it.
         key = data['preapproval'].paypal_key
         if key: