Werk #4223: Fixed possible g_host_attribute related AttributeError exception

Component	Setup
Title	Fixed possible g_host_attribute related AttributeError exception
Date	Dec 23, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.4.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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