Werk #11909: Fix hostname as required field in host search

Component	User interface
Title	Fix hostname as required field in host search
Date	Jan 7, 2021
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.1.0b1 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME) 2.0.0b4 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk MSP (CME)

The field "Hostname" was required for searching for any host. This is of course not intended in a search and has been fixed.

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