commands: Print the "deploy not available" error message even if flags provided

Fixes #13012

main_withdeploy_off_test.go

@@ -0,0 +1,29 @@
+// Copyright 2024 The Hugo Authors. All rights reserved.
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+// http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+//go:build !withdeploy
+// +build !withdeploy
+
+package main
+
+import (
+	"testing"
+
+	"github.com/rogpeppe/go-internal/testscript"
+)
+
+func TestWithdeploy(t *testing.T) {
+	p := commonTestScriptsParam
+	p.Dir = "testscripts/withdeploy-off"
+	testscript.Run(t, p)
+}