Fixed empty filename when trying to export a plate where no object is selected and no object is printable
Fixed empty filename when trying to export a plate where no object is selected and no object is printable

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