Werk #3372: check_mailboxes: Improved error handling

Component	Checks & agents
Title	check_mailboxes: Improved error handling
Date	Apr 6, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.2.8b10 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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