[VNFPackageManagement-API.IndividualVNFPackage] The 'descriptor_id' is fetched as None, causing validation failure

File: SOL005/VNFPackageManagement-API/VNFPackageManagementKeywords.robot Line: around 200

---

Fetch Information from SOL001 descriptor file
    Import Variables    ${CURDIR}/descriptors/SOL001/VNFD/vnfd_SOL001.yaml
    ${descriptor_id}=    Get Variable Value    ${topology_template.node_templates.properties.descriptor_id}
    ${provider}=    Get Variable Value    ${topology_template.node_templates.properties.provider}
    ${product_name}=    Get Variable Value    ${topology_template.node_templates.properties.product_name}
    ${software_version}=    Get Variable Value    ${topology_template.node_templates.properties.software_version}
    ${descriptor_version}=    Get Variable Value    ${topology_template.node_templates.properties.descriptor_version}

---

${topology_template.node_templates.properties.descriptor_id} evaluates to None, as the file SOL005/VNFPackageManagement-API/descriptors/SOL001/VNFD/vnfd_SOL001.yaml does not have 'properties' under 'topology_template.node_templates'. And this is pretty much true for all the variables listed above, provider, product_name, ... so on.

Are the descriptor files (e.g. SOL001/VNFD/vnfd_SOL001.yaml) provided in the plugtest source for reference purposes only?