Test failures when setting a value on a destroyed initials mixin.

[kiwiupover]

I'm getting test failures Cannot call writeDeps after the object is destroyed. when the trying call method on the initials mixin is destroyed.

Versions:
DEBUG: Ember : 2.13.4
DEBUG: Ember Data : 2.12.2

a fix

backgroundColor: Ember.computed('colors.length', 'seedText', 'defaultName', 'defaultBackground', function () {
    if (this.isDestroyed) { return; }

    if (this.get('seedText') === this.get('defaultName')) {
      return this.get('defaultBackground');
    } else {
      let index = ColorIndex(this.get('seedText'), this.get('colors.length'));
      return this.get('colors')[index];
    }
  }),