Werk #1784: Fix exception in BI Boxes when parents are being used

Component	BI
Title	Fix exception in BI Boxes when parents are being used
Date	Dec 16, 2014
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.2.7i1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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