release-20.1:Backport!3450

Merged Andrey Vertiprahov requested to merge cherry-pick-a614eb9a into release-20.1

DCN.DCWL.get_metrics. Fix empty mac address.

See merge request !3450 (merged)

(cherry picked from commit a614eb9a)

2e84a85a DCN.DCWL.get_metrics. Fix empty mac address.

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