ESD-34143: Prevent saving branding data in ul customize command if em…

…pty (#968)

Prevent saving branding data in ul customize command if empty

internal/cli/universal_login_customize.go

@@ -607,14 +607,26 @@ func saveUniversalLoginBrandingData(ctx context.Context, api *auth0.API, data *u
 	group, ctx := errgroup.WithContext(ctx)
 
 	group.Go(func() (err error) {
+		if data.Settings == nil || data.Settings.String() == "{}" {
+			return nil
+		}
+
 		return api.Branding.Update(ctx, data.Settings)
 	})
 
 	group.Go(func() (err error) {
+		if data.Template == nil || data.Template.String() == "{}" {
+			return nil
+		}
+
 		return api.Branding.SetUniversalLogin(ctx, data.Template)
 	})
 
 	group.Go(func() (err error) {
+		if data.Theme == nil || data.Theme.String() == "{}" {
+			return nil
+		}
+
 		existingTheme, err := api.BrandingTheme.Default(ctx)
 		if err == nil {
 			return api.BrandingTheme.Update(ctx, existingTheme.GetID(), data.Theme)