Missing dataplane secret is non-fatal on deletion of a haproxy offloader.

We assume that the Service is being deleted, and delete Secret has
already been executed; then it is not necessary to re-configure
the offloader, since it wil be deleted altogether.

pkg/haproxy/haproxy.go

@@ -582,6 +582,12 @@ func (hc *Controller) removeOffldrInstances(
 	insts []*haproxyInst) (errs OffldrErrors) {
 
 	for _, inst := range insts {
+		if inst.dplanePasswd == nil || *inst.dplanePasswd == "" {
+			hc.log.Warnf("Remove offloader instance %s: "+
+				"dataplane password not set, assuming that "+
+				"the instance is already deleted", inst.name)
+			continue
+		}
 		version := inst.status.version + 1
 		hc.log.Debugf("haproxy instance %s: starting tx for version "+
 			"%d", inst.name, version)