Werk #2597: Fix settings downtimes on BI aggregates in distributed environment

Component	User interface
Title	Fix settings downtimes on BI aggregates in distributed environment
Date	Sep 16, 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

This fixes the exception about a missing key site.

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