Fixed crash after deleting of the part with no extruder options in configuration
Fixed crash after deleting of the part with no extruder options in configuration

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