Possible bug in live-build - unable build grub iso-hybrid image

[Igor Cher <igorflint@gmail.com>]

Web images autobuilder (http://cgi.build.live-systems.org/cgi-bin/live-build) build ISO image without errors but this image is not iso-hybrid, it's just usual iso which won't boot from flash disk.

My build: http://cgi.build.live-systems.org/build/20141003.103636.930651758/

# live-build-cgi "4.0.2-1" build file
# Fri, 03 Oct 2014 10:36:36 +0000

_BUILD="20141003.103636.930651758"
_EMAIL=""

REMOTE_ADDR=""

# CGI Packages List
_LB_CGIPACKAGES=""

# CGI Config for git
_LB_CONFIG="standard"

# Standard options
LIVE_IMAGE_TYPE="iso-hybrid"
LB_DISTRIBUTION="jessie"
LB_APT="apt"

# Advanced bootstrap options
LIVE_IMAGE_ARCHITECTURE="i386"
LIVE_IMAGE_ARCHIVE_AREAS="main"

# Advanced chroot options
LB_CHROOT_FILESYSTEM="squashfs"
LB_LINUX_FLAVOURS="486"
LB_SECURITY="true"

# Advanced binary options
LB_APT_INDICES="true"
LB_BOOTAPPEND_INSTALL=""
LB_BOOTAPPEND_LIVE=""
LB_BOOTLOADER="grub"
LB_DEBIAN_INSTALLER="false"
LB_ISO_APPLICATION="Debian Live"
LB_ISO_PREPARER="live-build; http://live-systems.org/devel/live-build/"
LB_ISO_PUBLISHER="Live Systems project; http://live-systems.org/; debian-live@lists.debian.org"
LB_ISO_VOLUME="Debian Live 20141003-10:35"
LB_MEMTEST="memtest86+"
LB_NET_ROOT_PATH="/srv/debian-live"
LB_NET_ROOT_SERVER="192.168.1.1"

# Advanced source options
LB_SOURCE_IMAGES="tar"
LB_SOURCE="false"