Werk #12668: API folder_config: fixing the show endpoint which did not work for the root folder

Component	Core & setup
Title	API folder_config: fixing the show endpoint which did not work for the root folder
Date	Mar 24, 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 2.0.0p2 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

In the previous version, it was not possible for the get the root folder through the show endpoint. This werk fixes this behavior.

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