saved_segment_id attribute should be optional when a campaign has segment options

When I save a campaign programmatically using the function mailchimp_campaign_save_campaign
And I want to have a new segments_opts without saved_segment_id specified, i'm getting:
An error occurred testing a list segment: 404: Resource Not Found - The requested resource could not be found.

The problem is in this part-
mailchimp\modules\mailchimp_campaign\mailchimp_campaign.module line 91:

  // Test for valid list segment, if selected.
  if (isset($recipients->segment_opts)) {
    if (mailchimp_test_list_segment($recipients->list_id, $recipients->segment_opts->saved_segment_id) === NULL) {
      return NULL;
    }
  }

And this function:
mailchimp_test_list_segment that requires a value for $recipients->segment_opts->saved_segment_id .

It should be an optional field, and in the case of missing this parameter- a new segment should be created.

From MailChimp documentation: campaigns -> recipients -> segment_opts -
https://developer.mailchimp.com/documentation/mailchimp/reference/campai...

segment_opts	
An object representing all segmentation options. This object should contain a saved_segment_id to use an existing segment, or you can create a new segment by including both match and conditions options.
 

Example of $recipients variable to be sent to mailchimp_campaign_save_campaign function -

  'list_id' => string '123'
  'segment_opts' => 
      'match' => 'any'
      'conditions' => 
        0 => 
          'condition_type' => 'Interests'
          'op' => string 'interestcontainsall'
          'field' => string 'interests-1e2351'
          'value' => 
            0 => string 'a11'