Getting error while introspecting node without mac address while using redfish driver

Issue

• While Introspecting node Getting below error

  $ openstack baremetal node list
  +--------------------------------------+------+---------------+-------------+--------------------+-------------+
  | UUID                                 | Name | Instance UUID | Power State | Provisioning State | Maintenance |
  +--------------------------------------+------+---------------+-------------+--------------------+-------------+
  | b7f3911b-34b0-4b39-ae4d-3f06f789008c | None | None          | power off   | manageable         | False       |
  +--------------------------------------+------+---------------+-------------+--------------------+-------------+
  

  (undercloud) [stack@undercloud' ~]$ openstack overcloud node introspect "b7f3911b-34b0-4b39-ae4d-3f06f789008c" --provide
  Waiting for introspection to finish...
  Started Mistral Workflow tripleo.baremetal.v1.introspect. Execution ID: 51a4c514-da04-4c11-b81f-22536940a783
  Waiting for messages on queue 'tripleo' with no timeout.
  Introspection of node b7f3911b-34b0-4b39-ae4d-3f06f789008c completed. Status:FAILED. Errors:No lookup attributes were found, inspector won't be able to find it after introspection, consider creating ironic ports or providing an IPMI address
  Retrying 1 nodes that failed introspection. Attempt 2 of 3
  Introspection of node b7f3911b-34b0-4b39-ae4d-3f06f789008c completed. Status:FAILED. Errors:No lookup attributes were found, inspector won't be able to find it after introspection, consider creating ironic ports or providing an IPMI address
  Retrying 1 nodes that failed introspection. Attempt 3 of 3
  Introspection of node b7f3911b-34b0-4b39-ae4d-3f06f789008c completed. Status:FAILED. Errors:No lookup attributes were found, inspector won't be able to find it after introspection, consider creating ironic ports or providing an IPMI address
  Retry limit reached with 1 nodes still failing introspection