Bug#654695: debian-installer fails to configure grub-installer

[Konstantin Petrishchev <bobafett.wrk@gmail.com>]

Package: debian-installer
Severity: important
Tags: d-i

debian-installer from daily build amd64 netinstaller (20120105) cannot
configure grub-installer which leads to abort of the installation process.
Info from tty4:
main-menu[320]: (process:14327): Wrong number of args: mapdevfs <path>
main-menu[320]: WARNING **: Configuring 'grub-installer' failed with error code
1
main-menu[320]: WARNING **: Menu item 'grub-installer' failed.



-- System Information:
Debian Release: wheezy/sid
  APT prefers testing
  APT policy: (500, 'testing'), (500, 'stable')
Architecture: amd64 (x86_64)

Kernel: Linux 3.0.0-1-amd64 (SMP w/2 CPU cores)
Locale: LANG=ru_RU.utf8, LC_CTYPE=ru_RU.utf8 (charmap=UTF-8)
Shell: /bin/sh linked to /bin/dash