[REGRESSION] MDM user pre-selection breaks login for users with no password

[tavvva]

The following issue was resolved in a way, that needs more tuning ...

#14

If you have user accounts with no password, then the very first selection of such user ends with immediate automatic re-login of that user when you try to logout ... the user is pre-selected and as there's no reason for entering the password, mdm automatically skips that step and immediately proceeds with the login ...

My parents want to have separate profiles, but do not want to enter passwords as they trust each other ...

Steps to reproduce:

1.) useradd -m someuser
2.) passwd -d someuser
3.) select a theme with userlist
4.) logout
5.) login as someuser
6.) and now try to logout :(

[clefebvre]

Fixed.