zfs: fix handling of the "snapshot only" send case
zfs: fix handling of the "snapshot only" send case

Signed-off-by: Tycho Andersen <10c18fcb898ee6b17d6575d444b125d10b3f4d6a@canonical.com>

atxwebs/lxd,erikmack/lxd,hallyn/lxd,atxwebs/lxd,stgraber/lxd,atxwebs/lxd,stgraber/lxd,ollie314/lxd,stgraber/lxd,lxc/lxd,lxc/lxd,hallyn/lxd,jsavikko/lxd,jsavikko/lxd,akshaykarle/lxd,pcdummy/lxd,erikmack/lxd,lxc/lxd,stgraber/lxd,Skarlso/lxd,yura-pakhuchiy/lxd,erikmack/lxd,hallyn/lxd,techtonik/lxd,pcdummy/lxd,stgraber/lxd,akshaykarle/lxd,Skarlso/lxd,georghopp/lxd,techtonik/lxd,stgraber/lxd,chrisglass/lxd,yura-pakhuchiy/lxd,akshaykarle/lxd,georghopp/lxd,Skarlso/lxd,hallyn/lxd,hallyn/lxd,pcdummy/lxd,atxwebs/lxd,techtonik/lxd,mjeanson/lxd,mjeanson/lxd,chrisglass/lxd,lxc/lxd,ollie314/lxd,Skarlso/lxd,lxc/lxd,lxc/lxd,yura-pakhuchiy/lxd,georghopp/lxd,lxc/lxd,mjeanson/lxd,ollie314/lxd,hallyn/lxd,chrisglass/lxd,jsavikko/lxd,stgraber/lxd