Ensure ::getDefaultLanguage() always returns a valid value

I have a problem when running a Feeds import to create Mongo Node entities, which should be translatable later on.

If I'm setting the default language at /admin/config/regional/entity_translation to ENTITY_TRANSLATION_LANGUAGE_DEFAULT or ENTITY_TRANSLATION_LANGUAGE_CURRENT it works fine.

But if I set it to ENTITY_TRANSLATION_LANGUAGE_AUTHOR and I'm running the import as a user which has no language set (ex. superadmin) or as an anonymous user (ex. Beanstalkd background job) then there is no $GLOBALS['user']->language in getDefaultLanguage() from EntityTranslationDefaultHandler so the function returns an empty string.

Thus, no data will be stored in the entity_translation table in the database associated to the current entity I'm creating.
(This way I get an access denied error on the edit and translate tabs of the entity. #2467509: Access Denied on edit / translate tabs of entity)

Shouldn't this code:

case ENTITY_TRANSLATION_LANGUAGE_AUTHOR:
  $langcode = $GLOBALS['user']->language;
  break;

be something like this:

case ENTITY_TRANSLATION_LANGUAGE_AUTHOR:
  if (isset($this->entity->uid) {
    $account = user_load($this->entity->uid);
    if (isset($account->language) && $account->language) {
      $langcode = $account->language;
    }
     else {
       // Fall back to current / default language?
    }
  }
  break;