Fix an issue where we try to access a nil pointer

Getting the sync progress of a deployment can sometimes fail and
return back a nil result. This happens rarely but when it does
we don't want to panic

cmd/update/volume_move.go

@@ -252,7 +252,7 @@ func (c *volumeMoveCommand) waitForSyncedReplicaOnNode(ctx context.Context, nsID
 				if rep.Node.String() == c.toNode {
 					if rep.Promotable {
 						return nil
-					} else {
+					} else if rep.SyncProgress != nil {
 						c.display.ReplicaSyncProgress(ctx, c.writer, *rep.SyncProgress)
 					}
 				}