Werk #12036: Fix host/service view export containing icons

Component	User interface
Title	Fix host/service view export containing icons
Date	Feb 2, 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 2.0.0b6 Checkmk Community, Checkmk Pro, Checkmk Ultimate MT

Views containing icons could not be exported using output_format=[json|json_export].

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