Werk #12514: zerto_vpg_rpo: Fix crash of plugin

Component Checks & agents
Title zerto_vpg_rpo: Fix crash of plugin
Date May 12, 2021
Checkmk Edition Checkmk Raw (CRE)
Checkmk Version 2.0.0p5 2.1.0b1
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The plugin crashed with the message "Wrong usage of decorator function".

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