Remove unnecessary email generation in OAuth login

Handled by the `emaIl_required` flag already

endpoints/oauthlogin.py

@@ -1,5 +1,4 @@
 import logging
-import uuid
 
 from flask import request, redirect, url_for, Blueprint
 from peewee import IntegrityError
@@ -60,16 +59,12 @@ def _conduct_oauth_login(service_id, service_name, user_id, username, email, met
         new_username = valid
         break
 
-      # Generate a valid email. If the email is None and the MAILING feature is turned
-      # off, simply place in a fake email address.
-      if email is None and not features.MAILING:
-        email = '%s@fake.example.com' % (str(uuid.uuid4()))
-
       prompts = model.user.get_default_user_prompts(features)
       to_login = model.user.create_federated_user(new_username, email, service_id,
                                                   user_id, set_password_notification=True,
                                                   metadata=metadata or {},
-                                                  prompts=prompts)
+                                                  prompts=prompts,
+                                                  email_required=features.MAILING)
 
       # Success, tell analytics
       analytics.track(to_login.username, 'register', {'service': service_name.lower()})