FEM: purge results gui tool, make it active if only result meshes are left in an analysis
FEM: purge results gui tool, make it active if only result meshes are left in an analysis

Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master,Fat-Zer/FreeCAD_sf_master