Adding nil check and updating flag name for consistency with other flags

docs/installation/install.md

@@ -120,7 +120,7 @@ Alternatively, you can manually set a different name with the `--cluster-name` *
 ```{admonition} Note
 If you are running an [AKS private cluster](https://learn.microsoft.com/en-us/azure/aks/private-clusters), you may need to set the `--disable-api-server-sanity-check` *liqoctl* flag, since the API Server in your kubeconfig may be different from the one retrieved from the Azure APIs.
 
-If the private cluster uses private link, you can set the `--privateLink` *liqoctl* flag to use the private FQDN for the API server.
+If the private cluster uses private link, you can set the `--private-link` *liqoctl* flag to use the private FQDN for the API server.
 
 Additionally, since your API Server is not accessible from the public Internet, you shall leverage the [in-band peering approach](FeaturesPeeringInBandControlPlane) towards the clusters not attached to the same Azure Virtual Network.
 ```

pkg/liqoctl/install/aks/provider.go

@@ -77,7 +77,7 @@ func (o *Options) RegisterFlags(cmd *cobra.Command) {
 	cmd.Flags().StringVar(&o.vnetResourceGroupName, "vnet-resource-group-name", "",
 		"The Azure ResourceGroup name of the Virtual Network (defaults to --resource-group-name if not provided)")
 	cmd.Flags().StringVar(&o.fqdn, "fqdn", "", "The private AKS cluster fqdn")
-	cmd.Flags().BoolVar(&o.privateLink, "privateLink", false, "Use the private FQDN for the API server")
+	cmd.Flags().BoolVar(&o.privateLink, "private-link", false, "Use the private FQDN for the API server")
 
 	utilruntime.Must(cmd.MarkFlagRequired("resource-group-name"))
 	utilruntime.Must(cmd.MarkFlagRequired("resource-name"))
@@ -162,6 +162,9 @@ func (o *Options) parseClusterOutput(ctx context.Context, cluster *containerserv
 
 	switch {
 	case o.privateLink:
+		if cluster.PrivateFQDN == nil {
+			return fmt.Errorf("private FQDN not found on cluster")
+		}
 		o.APIServer = *cluster.PrivateFQDN
 	case cluster.Fqdn != nil:
 		o.APIServer = *cluster.Fqdn