internal commands: add EmptyBody filter function
internal commands: add EmptyBody filter function

EmptyBody is like NoBody, but also accepts an empty JSON object ("{}").

Signed-off-by: John Mulligan <eda8ad33169deab44f9fe65847f99e368da6c91b@redhat.com>

ceph/go-ceph,ceph/go-ceph,ceph/go-ceph