fix(k8s): set PNID to empty string in read if no PN (#2077)

* fix(k8s): set PNID to empty string in read if no PN

* Update scaleway/resource_k8s_cluster.go

Co-authored-by: Nathanael Demacon <[email protected]>

---------

Co-authored-by: Nathanael Demacon <[email protected]>
Co-authored-by: Nathanael Demacon <[email protected]>

Author: Mia-Cross

scaleway/resource_k8s_cluster.go

@@ -520,9 +520,7 @@ func resourceScalewayK8SClusterRead(ctx context.Context, d *schema.ResourceData,
 	_ = d.Set("auto_upgrade", clusterAutoUpgradeFlatten(cluster))
 
 	// private_network
-	if cluster.PrivateNetworkID != nil {
-		_ = d.Set("private_network_id", cluster.PrivateNetworkID)
-	}
+	_ = d.Set("private_network_id", flattenStringPtr(cluster.PrivateNetworkID))
 
 	////
 	// Read kubeconfig

scaleway/resource_k8s_cluster_test.go

@@ -403,7 +403,7 @@ func TestAccScalewayK8SCluster_PrivateNetwork(t *testing.T) {
 				Check: resource.ComposeTestCheckFunc(
 					testAccCheckScalewayK8SClusterExists(tt, "scaleway_k8s_cluster.private_network"),
 					testAccCheckScalewayVPCPrivateNetworkExists(tt, "scaleway_vpc_private_network.private_network"),
-					resource.TestCheckNoResourceAttr("scaleway_k8s_cluster.private_network", "private_network_id"),
+					resource.TestCheckResourceAttr("scaleway_k8s_cluster.private_network", "private_network_id", ""),
 				),
 			},
 			{