code: function constructCredentials(password, question, answer) {
      var credentials = {};
      if(password) credentials.password = constructPassword(password);
      if(question && answer) credentials.recovery_question = constructRecoveryQuestion(question, answer);
      return credentials;
  }
docs: Constructs an object that reflects the structure of an Okta Credentials Object
  If you don't want to set a pw or recovery question just pass in null or empty string
  @method constructCredentials
  @param password
  @param question
  @param answer
  @returns {{}}