Remove error notification when user deletes repos

Also prevent duplicate notifications of that type.

fixes #493

endpoints/api/billing.py

@@ -18,15 +18,14 @@ import features
 import uuid
 import json
 
-def lookup_allowed_private_repos(namespace):
-  """ Returns false if the given namespace has used its allotment of private repositories. """
-  # Lookup the namespace and verify it has a subscription.
+def get_namespace_plan(namespace):
+  """ Returns the plan of the given namespace. """
   namespace_user = model.user.get_namespace_user(namespace)
   if namespace_user is None:
-    return False
+    return None
 
   if not namespace_user.stripe_id:
-    return False
+    return None
 
   # Ask Stripe for the subscribed plan.
   # TODO: Can we cache this or make it faster somehow?
@@ -36,14 +35,20 @@ def lookup_allowed_private_repos(namespace):
     abort(503, message='Cannot contact Stripe')
 
   if not cus.subscription:
+    return None
+
+  return get_plan(cus.subscription.plan.id)
+
+
+def lookup_allowed_private_repos(namespace):
+  """ Returns false if the given namespace has used its allotment of private repositories. """
+  current_plan = get_namespace_plan(namespace)
+  if current_plan is None:
     return False
 
   # Find the number of private repositories used by the namespace and compare it to the
   # plan subscribed.
   private_repos = model.user.get_private_repo_count(namespace)
-  current_plan = get_plan(cus.subscription.plan.id)
-  if current_plan is None:
-    return False
 
   return private_repos < current_plan['privateRepos']