[tryton] bug in carrier-weight ?

[JC Michel]

Hi,

When using carrier-weight to compute an invoice line for a carrier 
depending on weight:
when coming back, in Sale, to Draft state to edit the Carrier, the 
generated carrier invoice line is not deleted,
and creates an error
File "/trytond/modules/sale_shipment_cost/sale.py", line 207, in 
set_shipment_cost
    with Transaction().set_context(self._get_carrier_context()):
  File "/trytond/modules/carrier_weight/sale.py", line 33, in 
_get_carrier_context
    lines = sorted(lines, key=keyfunc)
TypeError: unorderable types: NoneType() < NoneType()

Seems that the carrier line doesn’t have a weight!
Deleting manually the invoice line seems to fix this.
IMHO the carrier line should be deleted when going back in Draft state.
Should I open a bug?

PS : tryton version 4.6

Jean-Christophe Michel
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