Cura: Ironing despite 0 Top Layers

[ameuret]

Application version
4.7.0

Platform
Linux

Printer
Custom (Monoprice Select Mini)

Reproduction steps

1. Add model
2. Add mesh modifier model (for overlaps and cutting mesh)
3. Set mesh modifier setting for Top Layers (and Bottom Layers) to 0
4. Enable Ironing (in general settings, not modifier mesh settings)
5. Slice and observe that an ironing pass is generated on unexisting top layer

I checked that when disabling the general _Enable Ironing_ setting, the spurious pass disappears.

Screenshot(s)

Actual results
Ironing pass is generated.

Expected results
No ironing pass when no layer to iron exists.

Project file
https://groupeactime-my.sharepoint.com/:u:/g/personal/arnaud_actime_biz/EcxK6WZSgddBvNyVxsksaCcBfdVV_pq_8sqBdMQlYonsTw?e=8Icew0

[rburema]

Also doesn't work the other way around (ironing on for modifier mesh, ironing off in general).