Checkmk Werk 14327: Prevent use of builtin snapin IDs for custom snapins

ID: 14327 Title: Prevent use of builtin snapin IDs for custom snapins Component: Multisite Level: 1 Class: Bug fix Version: 2.2.0i1 Custom sidebar snapins could be created with IDs like "tactical_overview", leading to multiple problems while rendering the snapins in the sidebar. You will now get an error message if such ID is used for custom sidebar snapins.