Werk #2944: Fixed exception during config activation having clusters with unresolvable node IP addresses

Component	Core & setup
Title	Fixed exception during config activation having clusters with unresolvable node IP addresses
Date	Jan 21, 2016
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i4 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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