Werk #19620: Fix crash when rendering reports with global customer context

Component	Reporting & availability
Title	Fix crash when rendering reports with global customer context
Date	May 5, 2026
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.6.0b1 Not yet released Checkmk Ultimate MT 2.5.0p2 Not yet released Checkmk Ultimate MT 2.4.0p29 Not yet released Checkmk Ultimate MT

Previously, rendering a report would crash with a KeyError: '' if the report's customer context was set to the global customer. This has been fixed.

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