HTMLBars helper with inverse

I'm trying to build a helper w/ an else block.

I can only find handlebars examples. They show that options.inverse is a function, but for my HTMLBars helper the options.inverse is an object. (e.g not callable)

template code:

  {{#can 'audit' 'user' }}
    AUDIT_LINK_PLACEHOLDER
  {{else}}
    NO_AUDIT_LINK
  {{/can}}

helper code:

Ember.Handlebars.registerHelper("can", function(verb, noun, options) {
  var abilities =  this.container.lookup('controller:application').currentAbilities;
  var sub_ability = abilities[noun] || {};
  var fn = (sub_ability[verb] || sub_ability['manage']) ? options.fn : options.inverse;
  return fn(this);
});