ubiquity-dm crashed with ValueError in command(): invalid literal for int() with base 10: ''

[Stéphane Graber]

While running some automated testing (http://www.stgraber.org/download/ubi-crash).

ProblemType: Crash
DistroRelease: Ubuntu 12.04
Package: ubiquity 2.10.3
ProcVersionSignature: Ubuntu 3.2.0-20.32-generic-pae 3.2.12
Uname: Linux 3.2.0-20-generic-pae i686
ApportVersion: 1.95-0ubuntu1
Architecture: i386
CasperVersion: 1.312
Date: Tue Mar 27 11:49:18 2012
ExecutablePath: /usr/bin/ubiquity-dm
InstallCmdLine: boot=casper -- debconf/priority=critical locale=en_US console-setup/ask_detect=false console-setup/layoutcode=us keyboard-configuration/layoutcode=us keyboard-configuration/variantcode=altgr-intl noprompt automatic-ubiquity url=http://www.stgraber.org/download/ubi-crash
InterpreterPath: /usr/bin/python2.7
LiveMediaBuild: Ubuntu 12.04 LTS "Precise Pangolin" - Beta i386 (20120327.1)
ProcCmdline: /usr/bin/python /usr/bin/ubiquity-dm vt7 :0 hostname /usr/bin/ubiquity --automatic --only
ProcEnviron:
 LANGUAGE=
 TERM=linux
 PATH=(custom, no user)
 LANG=
PythonArgs: ['/usr/bin/ubiquity-dm', 'vt7', ':0', 'hostname', '/usr/bin/ubiquity', '--automatic', '--only']
SourcePackage: ubiquity
Title: ubiquity-dm crashed with ValueError in command(): invalid literal for int() with base 10: ''
UpgradeStatus: No upgrade log present (probably fresh install)
UserGroups:

[Launchpad Janitor (janitor)]

Status changed to 'Confirmed' because the bug affects multiple users.