Fix UserOrg status during LDAP Import

When a user does not have an account yet and SMTP was disabled it would
set the UserOrg status still to Accepted, though that would make it
possible to verify the user by the Org Admin's.
This would fail, since the user didn't actually crated his account, and
therefor no PublicKey existed.

This PR fixes this behaviour by checking if the password is empty and if
so, puts the user to an `Invited` state instead of `Accepted`.

Fixes #3737