release-23.1:Backport!7205

Merged Andrey Vertiprahov requested to merge cherry-pick-988b6cf1 into release-23.1

noc/noc#2069 Generic.get_lldp_neighbors. Fix for device without lldpRemTimeMark in index.

See merge request !7205 (merged)

(cherry picked from commit 988b6cf1)

04f0704e Generic.get_lldp_neighbors. Fix for device without lldpRemTimeMark in index.

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