[2.3.0] Checkmk Werk 16885 created: Crash: liebert_maintenance: ValueError("Cannot render negative timespan") when time is overdue

[//]: # (werk v2) # Crash: liebert_maintenance: ValueError("Cannot render negative timespan") when time is overdue key | value ---------- | --- date | 2024-05-21T08:24:14+00:00 version | 2.3.0p3 class | fix edition | cre component | checks level | 1 compatible | yes `liebert_maintenance` check would crash with `ValueError("Cannot render negative timespan")` if the value for "Next maintenance" is in the past. This change now renders positive and negative values differently (also only printing days) adding `'overdue'` if date for next maintenance is located in the past.