Bug#400815: debian-installer: Can't skip to configure package manager after failed install base system after succeeded install base system

[Olaf van der Spek <OvdSpek@LIACS.NL>]

Package: debian-installer
Severity: normal

Hi,

I tried a daily image and wanted to see what it'd do if I selected "Install the base system twice". It gave a warning the second time, so I canceled.
Then I selected "Configure the package manager", but instead, it tried to install the base system again. It failed, but at the end it says the failed step is: Configure the 
package manager.

-- System Information:
Debian Release: 4.0
  APT prefers unstable
  APT policy: (500, 'unstable'), (500, 'testing'), (500, 'stable'), (1, 'experimental')
Architecture: i386 (i686)
Shell:  /bin/sh linked to /bin/bash
Kernel: Linux 2.6.18-2-686
Locale: LANG=C, LC_CTYPE=C (charmap=ANSI_X3.4-1968)