Werk #13867: Fix update preview of bulk import of hosts

Component User interface
Title Fix update preview of bulk import of hosts
Date Mar 24, 2022
Checkmk Editon Checkmk Raw (CRE)
Checkmk Version 2.2.0i1 2.1.0b4
Level Trivial Change
Class Bug Fix
Compatibility Compatible - no manual interaction needed

Werk #13675 fixed a NoneType error on updating the preview but the header was not rendered correctly after that fix.

The header is now rendered as intended with and without the option "Has title line".

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