[Bug 1788797] [NEW] Regression: Live session login via sddm (emtpy password) fails

[Rik Mills]

Public bug reported:

Series: Cosmic
sddm: 0.18.0-1ubuntu2 
casper: 1.395

Since casper change: https://launchpad.net/ubuntu/+source/casper/1.395

"Set empty live user password on all flavours, this was previously gdm
specific."

sddm login to the live session is not possible. e.g. should the live
session user log out or restart X/sddm

In discussion @ https://github.com/sddm/sddm/issues/751 it appears that
sddm does not support login with an empty password.

Focus of that discussion is more towards autologin when clicking a user
with a black password, but it is also clear that clicking login with no
password in the password box for a passwordless user will also fail.

** Affects: casper (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: sddm (Ubuntu)
     Importance: Undecided
         Status: New

** Affects: casper (Ubuntu Cosmic)
     Importance: Undecided
         Status: New

** Affects: sddm (Ubuntu Cosmic)
     Importance: Undecided
         Status: New

** Also affects: casper (Ubuntu)
   Importance: Undecided
       Status: New

** Also affects: casper (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

** Also affects: sddm (Ubuntu Cosmic)
   Importance: Undecided
       Status: New

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Title:
  Regression: Live session login via sddm (emtpy password) fails

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