Werk #13760: Alert Statistics Dashlet: Fix crash (internal error)

Component	User interface
Title	Alert Statistics Dashlet: Fix crash (internal error)
Date	Mar 11, 2022
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.2.0b1 Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.1.0b2 Checkmk Pro, Checkmk Ultimate MT

All alert statistics dashlets crashed with an internal error (AssertionError ()).

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