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 Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b2 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p22 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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

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