Werk #13761: cmk_site_statistics: Fix crash for pre-1.6 CRE sites

Component Checks & agents
Title <tt>cmk_site_statistics</tt>: Fix crash for pre-1.6 CRE sites
Date Mar 11, 2022
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.2.0i1 2.1.0b2 2.0.0p22
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

The check plugin cmk_site_statistics crashed for pre-1.6 CRE sites with KeyError (core_pid).

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