Werk #7957: msexchange: ignore invalid data in agent output

Component	Checks & agents
Title	msexchange: ignore invalid data in agent output
Date	Jul 29, 2019
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0p21 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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