release-20.4:Backport!4943

Merged Andrey Vertiprahov requested to merge cherry-pick-23938d6d into release-20.4

noc/noc#1473 Move get_leader_channel to try block. For catch connection exception.

See merge request !4943 (merged)

(cherry picked from commit 23938d6d)

e8b514f4 Move get_leader_channel to try block. For catch connection exception.

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