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
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.1.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

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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