The 2nd argument is supposed to be a user; however, only the tests for the client have a real user we can access. Any placeholder I put in (string, None, whatever) is really not quite right, but because only split uses the user, it's innocuous for now. However, when we wire studio to split, we will be adding user to all of the ms CRUD calls and should do so for these as well.

I'm open to whatever you or others think is the right 'for-now-lets-do-it-this-way' tack.