Werk #4027: BI Aggregations: fixed compilation problem with BI aggregations when using sites without hosts

Component	BI
Title	BI Aggregations: fixed compilation problem with BI aggregations when using sites without hosts
Date	Feb 21, 2017
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.5.0i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 1.4.0b3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

BI aggregations did not compile correctly for sites without hosts. Happens when there was an empty viewer site with several connected real sites.

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