Werk #13248: Fix empty BI sidebar snapins

Component	User interface
Title	Fix empty BI sidebar snapins
Date	Sep 28, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT 2.0.0p12 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

The sidebar snapins "BI aggregation groups" and "BI aggregation groups tree" were previously empty, even if BI groups and/or trees were configured.

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