Werk #17719: Host name validation on "Add host" page

Component	User interface
Title	Host name validation on "Add host" page
Date	May 16, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Not yet released Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.4.0p3 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.3.0p33 Checkmk Raw (CRE), Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

Prior to this werk, since the 2.3, when entering an invalid host name on the "Add host" page, the page was no longer shown correctly and the error message was not helpful.

Now the page is still being rendered, therefore the host name can again be edited and a useful error message is being displayed.

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