In testing my module for the first time, this error is reported
----------------------------------------------------------------------
Traceback (most recent call last):
File
"/home/catonano/tributi/env/lib/python3.6/site-packages/trytond/tests/test_tryton.py",
line 198, in wrapper
result = func(*args, **kwargs)
File
"/home/catonano/tributi/env/lib/python3.6/site-packages/trytond/tests/test_tryton.py",
line 361, in test_field_methods
getattr(record, attr)()
File
"/home/catonano/tributi/env/lib/python3.6/site-packages/trytond/model/fields/field.py",
line 106, in wrapper
return func(self, *args, **kwargs)
File
"/home/catonano/tributi/build/lib/trytond/modules/tributi/affissione.py", line
38, in on_change_with_fattoreGiorni
ng = abs((self.on_change_with_bollettaDataFine() -
self.on_change_with_bollettaDataInizio()).days)
TypeError: unsupported operand type(s) for -: 'NoneType' and 'NoneType'
----------------------------------------------------------------------
but when I run it in the GUI, fattoreGiorni DOES WORK
I swear !
You can see a picture here
https://imgur.com/a/kUUjs
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