Fix of "Slic3r 1.40.1-rc fails to retain the filament list on" https://github.com/prusa3d/Slic3r/issues/1020
Fix of
"Slic3r 1.40.1-rc fails to retain the filament list on"
https://github.com/prusa3d/Slic3r/issues/1020

prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r,prusa3d/Slic3r