Bug#907910: debian-installer: Not possible to reset root password

[Tuxicoman <debian@jesuislibre.net>]

Package: debian-installer
Severity: normal

Dear Maintainer,

I tested Debian testing installer the 4 september 2018

At one step, the installer asks for setting the root password.
I pressed Enter, without entering any password, and the installer went to the
next step (creating user accounts)

I tried to fix this by restarting at a previous step (network configuration)
but the root password step doesn't show anymore. It jumps to user account
creation step directly after network configuration.

Bugs are :
- maybe empty root password should not be allowed
- the root password setting step should be replayable



-- System Information:
Debian Release: buster/sid
  APT prefers testing
  APT policy: (500, 'testing')
Architecture: amd64 (x86_64)
Foreign Architectures: i386

Kernel: Linux 4.17.0-3-amd64 (SMP w/4 CPU cores)
Locale: LANG=fr_BE.utf8, LC_CTYPE=fr_BE.utf8 (charmap=UTF-8), LANGUAGE=fr_BE.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: AppArmor: enabled