ui-sref does not generate href attribute if url is not provided

[ilovett]

Similarl to #1293 -- I saw that this was fixed in 0.2.13

However, I've noticed that href is not generated unless explicitly setting url to an empty string url: ''

Shouldn't href also be generated if url is undefined / not provided? If not why?

  .state('settings', {
    templateUrl: 'views/settings.html',
    controller: 'SettingsCtrl'
  })

[ProLoser]

Because if you refresh the page it won't arrive at this state.