Build archival package failing

[jefferya]

Location: https://github.com/mjordan/islandora_bagger/pull/94/files#diff-0f6e8788c533961b891274a6b62644a7aaa08816544418f8ac74af674efd26aeL74

Change:

• from: $file_uri = $this->settings['drupal_base_url'] . '/entity/file/' . $media['field_media_file'][0]['target_id'];
• to: $file_uri = $this->settings['drupal_base_url'] . '/entity/file/' . $media[$media_source_field][0]['target_id'];

Example:

• Adding a Child Collection using the Islandora Content Modeler Module
• https://24325189-review-review-pre-845ia7.leaf-vre.org/media/7?_format=json

   "field_media_document": [
        {
            "target_id": 108,
            "display": null,
            "description": null,
            "target_type": "file",
            "target_uuid": "9de85d28-b159-4308-bb93-39ba1712e6f6"
        }