You are an expert in writing code in many different languages. Your goal is to perform code completion for the following code, keeping in mind the rest of the code and the file meta data.
    Metadata details:
    filename: project.go
    path of file: ./repos/erda/bundle
    
    the code of the file until where you have to start completion: // Copyright (c) 2021 Terminus, Inc.
//
// 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"
    
func (b *Bundle) GetProjectNamespaceWithoutErr(projectID uint64, workspace string) string {
	var isValidWS bool
	for _, v := range apistructs.DiceWorkspaceSlice {
		if workspace == v.String() {
			isValidWS = true
			break
		}
	}

	if !isValidWS {
		return ""
	}

	prjNs, err := b.GetProjectNamespaceInfo(projectID)
	if err != nil {
		logrus.Errorf("[project namespace] get project namespace err: %v", err)
		return ""
	}

	if !prjNs.Enabled {
		return ""
	}

	return prjNs.Namespaces[workspace]
}