release-19.1:Backport!2037

Merged Andrey Vertiprahov requested to merge cherry-pick-2874d751 into release-19.1

Fix Generic.get_capabilities script when SNMP false.

See merge request !2037 (merged)

(cherry picked from commit 2874d751)

2e6825cf Fix Generic.get_capabilities script when SNMP false.

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