Add content validation step to FormatValidator. Check tombstone payload correctness. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Linking object carries only identifier of the parent object. Fix Validate method of FormatValidator to not validate parent object of the linking object. Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>
Signed-off-by: Leonard Lyubich <leonard@nspcc.ru>