Werk #12963: Fix BI aggregation work tree

Component User interface
Title Fix BI aggregation work tree
Date Jun 17, 2021
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.0.0p6 2.1.0i1 1.6.0p25
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Sometimes several trees were opened when a single tree was clicked to open.

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