confirm the current hypervisor value doesn't get cleared out

Signed-off-by: Jeff Carr <jcarr@wit.com>

poll.go

@@ -54,6 +54,9 @@ func (h *HyperT) pollHypervisor() {
 		start := d.SprintHeader()
 		h.lastDroplets[name] = time.Now()
 		if state == "OFF" {
+			if d.Current.Hypervisor == "" {
+				d.Current.Hypervisor = h.pb.Hostname
+			}
 			if d.LocalOnly == "" {
 				log.Log(WARN, start, "local domain is a duplicate (need to resolve this)")
 				continue