Some small fixes in the API.

endpoints/api/billing.py

@@ -206,12 +206,18 @@ class UserPlan(ApiResource):
     plan = request_data['plan']
     token = request_data['token'] if 'token' in request_data else None
     user = get_authenticated_user()
+    if not user:
+      raise Unauthorized()
+    
     return subscribe(user, plan, token, False)  # Business features not required
 
   @nickname('getUserSubscription')
   def get(self):
     """ Fetch any existing subscription for the user. """
     user = get_authenticated_user()
+    if not user:
+      raise Unauthorized()
+
     private_repos = model.get_private_repo_count(user.username)
 
     if user.stripe_id: