Repctl: Set migration namespace only if it is provided (#100)

repctl/pkg/cmd/migrate.go

@@ -1,5 +1,5 @@
 /*
- Copyright © 2022 Dell Inc. or its subsidiaries. All Rights Reserved.
+ Copyright © 2022-2023 Dell Inc. or its subsidiaries. All Rights Reserved.
 
  Licensed under the Apache License, Version 2.0 (the "License");
  you may not use this file except in compliance with the License.
@@ -341,7 +341,9 @@ func migratePV(ctx context.Context, cluster k8s.ClusterInterface, pvName string,
 	}
 	log.Infof("Setting migration annotation %s on pv %s", migrationAnnotation+"/"+toSC, pv.Name)
 	pv.Annotations[migrationAnnotation] = toSC
-	pv.Annotations[migrationNS] = targetNS
+	if len(targetNS) > 0 {
+		pv.Annotations[migrationNS] = targetNS
+	}
 	err = cluster.UpdatePersistentVolume(context.Background(), pv)
 	if err != nil {
 		log.Error(err, "unable to update persistent volume")