All the admin pages need to have a default user value

[Matthew-Burfield]

I'm getting this warning when loading any of the admin pages. I think it's because the auth returns a null user initially until the response from auth0 comes back.

index.js:1 Warning: Failed prop type: The prop `auth.user` is marked as required in `Admin`, but its value is `null`.
    in Admin (created by withAuth(Admin))
    in withAuth(Admin) (at _app.js:21)
    in UserProvider (created by Auth0Provider)
    in Auth0Provider (at _app.js:14)
    in MyApp
    in Container (created by AppContainer)
    in AppContainer