Return early on ping error

Found that this caused a panic after many many test runs.
It seems like we should have returned early since the pingResult is nil.
We don't want to update a lease when ping fails.

node/lease_controller_v1.go

@@ -114,6 +114,7 @@ func (c *leaseController) sync(ctx context.Context) {
 	pingResult, err := c.nodeController.nodePingController.getResult(ctx)
 	if err != nil {
 		log.G(ctx).WithError(err).Error("Could not get ping status")
+		return
 	}
 	if pingResult.error != nil {
 		log.G(ctx).WithError(pingResult.error).Error("Ping result is not clean, not updating lease")