Werk #17647: forecast graphs: Fix 'IndexError' during configuration

Component	Metrics system
Title	forecast graphs: Fix 'IndexError' during configuration
Date	Feb 19, 2025
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.5.0b1 Not yet released Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME) 2.4.0b1 Checkmk Enterprise (CEE), Checkmk Cloud (CCE), Checkmk MSP (CME)

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