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

Title: Crash: liebert_maintenance: ValueError("Cannot render negative timespan") when time is overdue Class: fix Compatible: compat Component: checks Date: 1716279854 Edition: cre Level: 1 Version: 2.2.0p27 <code>liebert_maintenance</code> check would crash with <code>ValueError("Cannot render negative timespan")</code> if the value for "Next maintenance" is in the past. This change now renders positive and negative values differently (also only printing days) adding <code>'overdue'</code> if date for next maintenance is located in the past.