Merge pull request #1180 from egernst/qemu-cleanup-check

qemu: no state to save if QEMU isn't running

src/runtime/virtcontainers/qemu.go

@@ -2316,6 +2316,12 @@ func (q *qemu) toGrpc() ([]byte, error) {
 }
 
 func (q *qemu) save() (s persistapi.HypervisorState) {
+
+	// If QEMU isn't even running, there isn't any state to save
+	if q.stopped {
+		return
+	}
+
 	pids := q.getPids()
 	if len(pids) != 0 {
 		s.Pid = pids[0]