ubuntu-cpc: create VMDK's for disk images if they exist. Remove

assumption that disk1.img will exist.

live-build/ubuntu-cpc/hooks/040-vmdk-image.binary

@@ -6,16 +6,18 @@
 architecture=$(chroot chroot dpkg --print-architecture)
 
 extension="disk1.vmdk"
+
 case ${architecture} in
-         i386) image_target="binary/boot/disk.ext4";;
+         i386|amd64) ;;
-        amd64) image_target="binary/boot/disk-uefi.ext4"; extension="uefi1.vmdk";;
                   *) echo "VMDK images are not supported for ${architecture} yet.";
                      exit 0;;
 esac
 
 . /build/config/functions
 
-create_vmdk binary/boot/disk.ext4 livecd.ubuntu-cpc.disk1.vmdk
+if [ -e binary/boot/disk.ext4 ]; then
+    create_vmdk binary/boot/disk.ext4 livecd.ubuntu-cpc.disk1.vmdk
+fi
 
 if [ -e binary/boot/disk-uefi.ext4 ]; then
     create_vmdk binary/boot/disk-uefi.ext4 livecd.ubuntu-cpc.uefi.vmdk