Werk #14749: Fix TypeError on export of graph collections as PDF

Component	Reporting & availability
Title	Fix TypeError on export of graph collections as PDF
Date	Sep 2, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p12 Checkmk Pro, Checkmk Ultimate MT

If you exported a graph collection via "Export" - "This collection as PDF", the error "TypeError: string indices must be integers" occurred.

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