[2.1.0] Checkmk Werk 15711 created: Fix execution of local gadgets

Title: Fix execution of local gadgets Class: fix Compatible: compat Component: nagvis Date: 1696234096 Edition: cre Knowledge: doc Level: 1 Version: 2.1.0p34 Gadgets located in the local hierarchy of the site (at local/share/nagvis/htdocs/userfiles/gadgets) could not be used and resulted in "Forbidden" errors when trying to open them.