Werk #14884: Fix exception on export of BI views with output format python

Component	User interface
Title	Fix exception on export of BI views with output format python
Date	Sep 30, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0p14 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

If BI views were exportet with "output_format=python" the error "Exception: Painter 'aggr_treestate' returned invalid result" occurred.

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