Werk #12940: Agent version ignored if "unknown"

Component	Checks & agents
Title	Agent version ignored if "unknown"
Date	Oct 11, 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)

If Fritz or VNX agent has a version "unknown", the version will be ignored during checking.

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