throw validation error if slice has no creator
throw validation error if slice has no creator

open-cloud/xos,cboling/xos,cboling/xos,zdw/xos,opencord/xos,opencord/xos,open-cloud/xos,cboling/xos,zdw/xos,zdw/xos,opencord/xos,cboling/xos,open-cloud/xos,cboling/xos,zdw/xos