LXDM ignores selected session type if lang=0 in the config file. Tries to load Lubuntu session

[Serhiy]

Reproduce:
0. Set lang=0 in the config file
1. Select any session type (openbox, for example) and log in
2. LXDM tries to load Lubuntu session which is removed in my case (I have no idea how LXDM delusionally thinks that Lubuntu session exists at all), fails with message that can't be skipped with keyboard and has the oldest X style I know of, and then starts lxde session.

ProblemType: Bug
DistroRelease: Ubuntu 13.10
Package: lxdm 0.4.1-0ubuntu6
ProcVersionSignature: Ubuntu 3.11.0-13.20-generic 3.11.6
Uname: Linux 3.11.0-13-generic x86_64
NonfreeKernelModules: wl
ApportVersion: 2.12.5-0ubuntu2.1
Architecture: amd64
Date: Mon Nov 11 11:45:36 2013
InstallationDate: Installed on 2011-12-04 (707 days ago)
InstallationMedia: Ubuntu 11.10 "Oneiric Ocelot" - Release amd64 (20111012)
MarkForUpload: True
SourcePackage: lxdm
UpgradeStatus: Upgraded to saucy on 2013-10-28 (13 days ago)
mtime.conffile..etc.lxdm.lxdm.conf: 2013-11-11T02:14:41.908350
mtime.conffile..etc.pam.d.lxdm: 2013-11-11T11:26:32.270836