Checkmk Werk 13729: FIX CSV/JSON exports for some view columns

ID: 13729 Title: FIX CSV/JSON exports for some view columns Component: Multisite Level: 1 Class: Bug fix Version: 2.2.0i1 Views may contain columns which are not CSV exportable, ie.: LI: Graphs LI: BI tree LI: Host/service labels LI: Inventory trees Some of these are also not JSON exportable, ie.: LI: Graphs These columns are now exported with the constant strings "NOT_CSV_EXPORTABLE" and "NOT_JSON_EXPORTABLE".