vmtool: fix unprepare for zero args
vmtool: fix unprepare for zero args

usirin/koding,rjeczalik/koding,jack89129/koding,mertaytore/koding,sinan/koding,usirin/koding,drewsetski/koding,acbodine/koding,mertaytore/koding,szkl/koding,jack89129/koding,rjeczalik/koding,sinan/koding,drewsetski/koding,drewsetski/koding,alex-ionochkin/koding,kwagdy/koding-1,koding/koding,rjeczalik/koding,alex-ionochkin/koding,andrewjcasal/koding,jack89129/koding,acbodine/koding,andrewjcasal/koding,jack89129/koding,acbodine/koding,jack89129/koding,koding/koding,acbodine/koding,usirin/koding,sinan/koding,andrewjcasal/koding,alex-ionochkin/koding,mertaytore/koding,alex-ionochkin/koding,kwagdy/koding-1,cihangir/koding,koding/koding,mertaytore/koding,alex-ionochkin/koding,szkl/koding,kwagdy/koding-1,kwagdy/koding-1,acbodine/koding,gokmen/koding,drewsetski/koding,szkl/koding,sinan/koding,cihangir/koding,drewsetski/koding,usirin/koding,szkl/koding,jack89129/koding,andrewjcasal/koding,usirin/koding,sinan/koding,koding/koding,kwagdy/koding-1,mertaytore/koding,gokmen/koding,gokmen/koding,usirin/koding,jack89129/koding,sinan/koding,gokmen/koding,andrewjcasal/koding,szkl/koding,acbodine/koding,mertaytore/koding,rjeczalik/koding,andrewjcasal/koding,koding/koding,cihangir/koding,alex-ionochkin/koding,rjeczalik/koding,sinan/koding,cihangir/koding,sinan/koding,rjeczalik/koding,drewsetski/koding,gokmen/koding,acbodine/koding,koding/koding,cihangir/koding,usirin/koding,drewsetski/koding,andrewjcasal/koding,kwagdy/koding-1,drewsetski/koding,gokmen/koding,kwagdy/koding-1,alex-ionochkin/koding,rjeczalik/koding,cihangir/koding,koding/koding,mertaytore/koding,gokmen/koding,gokmen/koding,kwagdy/koding-1,jack89129/koding,cihangir/koding,usirin/koding,mertaytore/koding,rjeczalik/koding,szkl/koding,szkl/koding,acbodine/koding,alex-ionochkin/koding,szkl/koding,koding/koding,andrewjcasal/koding,cihangir/koding