Werk #12901: ps: Fix crash if only some node of a cluster provide memory info

Component	Checks & agents
Title	ps: Fix crash if only some node of a cluster provide memory info
Date	Jun 21, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0p6 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The ps check plugin crashed if services where clustered, but only some nodes provided a memory information and others did not.

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