Werk #15937: Fix error on edit of graph dashlets added via "Add to dashboard"

Component	User interface
Title	Fix error on edit of graph dashlets added via "Add to dashboard"
Date	Aug 16, 2023
Level	Trivial Change
Class	Bug Fix
Compatibility	Compatible - no manual interaction needed
Checkmk versions & editions	2.3.0b1 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT 2.2.0p8 Checkmk Community, Checkmk Pro, Checkmk Ultimate, Checkmk Ultimate MT

If you added a graph via "Add to dashboard", editing the dashlet in the dashboard resulted in an error like "Internal error: single_infos".

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