refuse empty passwords
refuse empty passwords

Signed-off-by: Jose R. Gonzalez <dd86e186b711d5d56365d8d00422c5efdde9bef8@gmail.com>

stgraber/lxd,stgraber/lxd,lxc/lxd,stgraber/lxd,lxc/lxd,atxwebs/lxd,lxc/lxd,hallyn/lxd,hallyn/lxd,hallyn/lxd,lxc/lxd,atxwebs/lxd,stgraber/lxd,stgraber/lxd,lxc/lxd,atxwebs/lxd,atxwebs/lxd,stgraber/lxd,lxc/lxd,hallyn/lxd,lxc/lxd,hallyn/lxd,stgraber/lxd,hallyn/lxd