code: function unlessHelper(params, hash, options) {
      return ifUnless(params, hash, options, !_emberViewsStreamsShould_display.default(params[0]));
    }
docs: The `unless` helper is the inverse of the `if` helper. Its block will be
  rendered if the expression contains a falsey value.  All forms of the `if`
  helper can also be used with `unless`.
  
  @method unless
  @for Ember.Templates.helpers
  @public