This can happen if there is an error very early during publication.

we don't support negative quantity (it is better represented by an
inversion of source and destination), and this allows better support of
the smallest slice in ERP5, more especially in SupplyLine_asCellRange,
where the title of the cell is computed with the min and max being None
or not.

See nexedi/slapos.core!307 (b7d5041e)

The real issue is probably in the launcher.js file, but it is more tricky to fix

See nexedi/slapos.core!313 (b02b2bff)

These are clone of Computer and Computer Partition, but used for virtual
computing devices, unrelated to physical hardware.