Werk #6696: BI configuration: Fixed invalid "Used by" link, fixed exception during bulk delete

Component	BI
Title	BI configuration: Fixed invalid "Used by" link, fixed exception during bulk delete
Date	Dec 7, 2018
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	1.6.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 1.5.0p10 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

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