Fixed a multi-material painting gizmo crash when extruders colors aren't initialized, which happens when switching between SLA and FDM printer.
Fixed a multi-material painting gizmo crash when extruders colors aren't initialized, which happens when switching between SLA and FDM printer.

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