Checkmk Werk 10559: Web API: Fix validation of non-ASCII characters in custom attributes

ID: 10559 Title: Web API: Fix validation of non-ASCII characters in custom attributes Component: Multisite Level: 1 Class: Bug fix Version: 1.7.0i1 When creating or editing a host using the Web API, the custom host attributes are not correctly validated. The GUI prevents the user from inserting non-ASCII characters, but the Web API did not. These unexpected characters could result in issues at different places of Checkmk.