release-19.3:Backport!2815

Merged Andrey Vertiprahov requested to merge cherry-pick-1c436a09 into release-19.3

Qtech.QSW2800.get_inventory. Fix trace when return result without 'HW version'.

See merge request !2815 (merged)

(cherry picked from commit 1c436a09)

6fce7af1 Qtech.QSW2800.get_inventory. Fix trace when return result without 'HW version'.

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