allow host and namespace be empty

[artemgurzhii]

Allow host and namespace be empty strings?

// app/services/ajax.js
export default AjaxService.extend({
  host: 'https://my-awesome-app.com',
  namespace: '/api/v1',
});

// Some controller/component action
this.ajax.request('/some-url', { namespace: '/' });

// Expected: GET 'https://my-awesome-app.com/api/v1/some-url'
// Result:   GET 'https://my-awesome-app.com/api/v1/some-url'


this.ajax.request('/some-url', { namespace: '' });

// Expected: GET 'https://my-awesome-app.com/some-url'
// Result:   GET 'https://my-awesome-app.com/api/v1/some-url'

Is there any reason for not using Ember.isNone check?