[Libvir] [PATCH] virsh dumpxml and create fails with no UNAME cdrom device

Hi, In the xmexample.hvm(/etc/xen/xmexample.hvm), no UNAME cdrom device is written. disk = [ 'file:/var/images/min-el3-i386.img,hda,w', ',hdc:cdrom,r' ] But virsh dumpxml fails if the domain has virtual cdrom device without UNAME. And virsh create fails if the domain config XML has no UNAME cdrom device, too. The attached patch adds to solve this problem. Signed-off-by: Nobuhiro Itou <fj0873gn(a)aa.jp.fujitsu.com&gt; Thanks, Nobuhiro Itou.