Fix always listing nodes during docker stack ps command on Kubernetes…

…. A user without node listing rights could not use this command as it always fails.

Signed-off-by: Silvin Lubecki <silvin.lubecki@docker.com>

cli/command/stack/kubernetes/ps.go

@@ -68,7 +68,7 @@ func printTasks(dockerCli command.Cli, options options.PS, namespace string, cli
 	names := map[string]string{}
 	nodes := map[string]string{}
 
-	n, err := client.Nodes().List(metav1.ListOptions{})
+	n, err := listNodes(client, options.NoResolve)
 	if err != nil {
 		return err
 	}
@@ -103,3 +103,10 @@ func resolveNode(name string, nodes *apiv1.NodeList, noResolve bool) (string, er
 	}
 	return name, nil
 }
+
+func listNodes(client corev1.NodesGetter, noResolve bool) (*apiv1.NodeList, error) {
+	if noResolve {
+		return client.Nodes().List(metav1.ListOptions{})
+	}
+	return nil, nil
+}