Werk #15305: prism_vm_stats: don't go stale if no memory usage present

Component	Checks & agents
Title	prism_vm_stats: don't go stale if no memory usage present
Date	Nov 2, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

State will be OK and "No memory usage data available" will be shown as summary.

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