License comments would leave two lines blanks if not specify author

[Colstuwjx]

I would see two line blanks if I create scaffold by kubebuilder init --domain tutorial.kubebuilder.io without --owner xxx, see the code snippet below:

/*


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.
*/

package main

import (
	"flag"
	"os"

	"k8s.io/apimachinery/pkg/runtime"
	utilruntime "k8s.io/apimachinery/pkg/util/runtime"
	clientgoscheme "k8s.io/client-go/kubernetes/scheme"
	_ "k8s.io/client-go/plugin/pkg/client/auth/gcp"
	ctrl "sigs.k8s.io/controller-runtime"
	"sigs.k8s.io/controller-runtime/pkg/log/zap"

	batchv1 "tutorial.kubebuilder.io/project/api/v1"
	"tutorial.kubebuilder.io/project/controllers"
	// +kubebuilder:scaffold:imports
)

var (
	scheme   = runtime.NewScheme()
	setupLog = ctrl.Log.WithName("setup")
)

func init() {
	utilruntime.Must(clientgoscheme.AddToScheme(scheme))

	utilruntime.Must(batchv1.AddToScheme(scheme))
	// +kubebuilder:scaffold:scheme
}

...

Yes, so we could see two lines blanks in the file head.

Should we have a default owner? or just prompt user to fillout this option?

/kind bug

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