fix issue with tag relationship pre-save

osf/models/user.py

@@ -1215,8 +1215,8 @@ def create_unregistered(cls, fullname, email=None):
  user.set_unusable_username()
  user.set_unusable_password()
  user.update_guessed_names()
+ user.save() # user needs to have a primary key value before tag relationship can be used.
  user.add_system_tag(unregistered_created_source_tag(email))
-
  return user
 
  def update_guessed_names(self):