live-build/auto/config: Don't try to install an empty task name when

building an image without a live task.

debian/changelog

@@ -1,3 +1,10 @@
+livecd-rootfs (2.76) UNRELEASED; urgency=low
+
+  * live-build/auto/config: Don't try to install an empty task name when
+    building an image without a live task.
+
+ -- Colin Watson <cjwatson@ubuntu.com>  Thu, 23 Aug 2012 09:43:38 +0100
+
 livecd-rootfs (2.75) quantal; urgency=low
 
   * Adjust for live-build interface changes up to 3.0~a57-1ubuntu1.

live-build/auto/config

@@ -229,7 +229,7 @@ case $PROJECT in
 		;;
 esac
 
-if [ "$PREINSTALLED" != "true" ]; then
+if [ "$PREINSTALLED" != "true" ] && [ "$LIVE_TASK" ]; then
 	add_task live "$LIVE_TASK"
 fi