Werk #16452: Fix 'AssertionError' if 'The last..', 'Date range', 'The next..' or 'Until' is configured in forecast graphs

Component	User interface
Title	Fix 'AssertionError' if 'The last..', 'Date range', 'The next..' or 'Until' is configured in forecast graphs
Date	Feb 20, 2024
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0p23 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0p40 Checkmk Pro, Checkmk Ultimate MT

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