Werk #19314: Graphs preview: Fix AssertionError 'target_number_of_labels > 0' in some edge cases

Component	User interface
Title	Graphs preview: Fix AssertionError 'target_number_of_labels > 0' in some edge cases
Date	Feb 20, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.5.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.4.0p22 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

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