Werk #5298: Fixed crash if only lower levels for humidity has been set

Component	Checks & agents
Title	Fixed crash if only lower levels for humidity has been set
Date	Sep 20, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

This bug may have concerned all humidity check plugins.

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