Werk #2314: Availability: fixed exception when grouping by host or service group

Component	User interface
Title	Availability: fixed exception when grouping by host or service group
Date	Jun 25, 2015
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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