Addition to fix #1895, skip image if no owner

Non conforming image names are not ignored anymore by the new rbd_ls
implementation, this patch adds the old behaviour.

This fix is a temporary workaround and should be removed, once the new
image name parser is ready.

Signed-off-by: Alwin Antreich <a.antreich@proxmox.com>

PVE/Storage/RBDPlugin.pm

@@ -176,6 +176,7 @@ sub rbd_ls {
 	my $image = $el->{image};
 
 	my ($owner) = $image =~ m/^(?:vm|base)-(\d+)-/;
+	next if !defined($owner);
 
 	$list->{$pool}->{$image} = {
 	    name => $image,