Werk #1775: logins: Fixed exception during check execution

Component	Checks & agents
Title	logins: Fixed exception during check execution
Date	Dec 18, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.6b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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