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CURA-4188 Custom FDM printers in 2.5 don't have multi-extrusion support but they do since 2.6. Upgrading from 2.5 to 2.6 will not create the missing extruder stacks for the old custom FDM printers, which causes a crash. This fix makes sure that all custom FDM printers will have 8 extruder stacks during the upgrade so that Cura can still start normally and those printers will still be usable.