Checkmk Werk 10985: systemd_units: Fix single service discovery

ID: 10985 Title: systemd_units: Fix single service discovery Component: Checks & agents Level: 1 Class: Bug fix Version: 1.7.0i1 In the ruleset {{Systemd Single Services Discovery}} you can configure {{Descriptions}}, {{Service unit names}} or {{States}}. If no {{States}} are configured but {{Descriptions}} or {{Service unit names}} Checkmk does not discover any service. All three parameters are optional. Checkmk should discover services if at least one entry matches. This has been fixed.