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

Component	Checks & agents
Title	cmk_site_statistics: Fix crash for pre-1.6 CRE sites
Date	Mar 11, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0b2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p22 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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

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