edit_user() will give PHP Notices if user_login is unset on add.

[gitlost]

If you call edit_user() programmatically to add a user then if $_POST['user_login'] isn't set you'll get multiple PHP Notices of Undefined property: stdClass::$user_login (as well as a WP error message). The attached patch sets it to blank on add if unset (the WP error message will still occur).

[gitlost]

Set $user->user_login to blank if adding and no $_POSTuser_login? set.