rgw_sal_motr: [CORTX-34113]Copy-Object API :Handled UnknownError while performing copy object using tagging directive COPY

[shraddhaghatol]

Problem: Getting "UnknownError" while performing copy object using tagging directive COPY on source object with no tags
Solution : Error occurs only when we put fresh object (without tagging) in bucket and perform copy-object operation with --tagging -directive COPY. No need to return error if empty tags are present. Even if tags are empty copy operation should get successful with --tagging-directive COPY.

If tags are empty we were returning with -66 error from copy_object_same_zone() function.

Signed-off-by: shraddhaghatol [email protected]

Checklist

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[priyanka25081999]

Very clean patch

[shraddhaghatol]

Ran ceph tests. All tests are successful.
following is the job link::
https://eos-jenkins.colo.seagate.com/job/Cortx-Automation/job/S3Server/job/S3-Compatibility-Test-Ceph-RGW/240/

[sachitanands]

looks good