Werk #2369: Fix exception in BI availability via table "Hostname Aggregations"

Component	BI
Title	Fix exception in BI availability via table "Hostname Aggregations"
Date	Jun 30, 2015
Level	Prominent Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i3 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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