virsh: omit OPTION section in 'virsh help' if no option exists
Don't print 'OPTION' if there's no options. Just behaves as DESCRIPTION does. This mostly affects 'interface' command group. Signed-off-by: NZhang Xiaohe <zhangxh@cn.fujitsu.com> Reported-by: NLi Yang <liyang.fnst@cn.fujitsu.com> Signed-off-by: NEric Blake <eblake@redhat.com>
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