[2.4.0] Checkmk Werk 15342 created: systemd_units_*_summary: Support units without description

[//]: # (werk v2) # systemd_units_*_summary: Support units without description key | value ---------- | --- date | 2024-08-20T13:41:37+00:00 version | 2.4.0b1 class | fix edition | cre component | checks level | 1 compatible | yes The parser assumed that there is always a description, but systemd seems to be okay with units without description. The units were still detected but some service details were missing, for example how long the service was in a temporary state.