Fixed a crash appeared when we try to update PlaterPresetComboBox for empty selected preset.
Fixed a crash
appeared when we try to update PlaterPresetComboBox for empty selected preset.

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