TypeError: None is not of type <class 'str'>

[PatrickDEissler]

If XML contains empty tags (self-closing, example: <ram:Content/>), the following error occurs:

    doc = DrafthorseDocument.parse(xml_bytes, strict=False)
  File "env/lib/python3.10/site-packages/drafthorse/models/elements.py", line 124, in parse
    return cls().from_etree(root, strict)
  File "env/lib/python3.10/site-packages/drafthorse/models/elements.py", line 114, in from_etree
    getattr(self, name).from_etree(child, strict)
  File "env/lib/python3.10/site-packages/drafthorse/models/elements.py", line 112, in from_etree
    getattr(self, name).add_from_etree(child, strict)
  File "env/lib/python3.10/site-packages/drafthorse/models/container.py", line 24, in add_from_etree
    childel.from_etree(root, strict)
  File "env/lib/python3.10/site-packages/drafthorse/models/elements.py", line 112, in from_etree
    getattr(self, name).add_from_etree(child, strict)
  File "env/lib/python3.10/site-packages/drafthorse/models/container.py", line 91, in add_from_etree
    self.add(root.text)
  File "env/lib/python3.10/site-packages/drafthorse/models/container.py", line 9, in add
    raise TypeError("{} is not of type {}".format(item, self.child_type))
TypeError: None is not of type <class 'str'>

Version: drafthorse~=2025.1.0

[barredterra]

Ideas:

• check if empty tags are allowed as per standard
• use the strict parameter to disable type validation entirely, or at least allow the None type along with expected type

[raphaelm]

I don't think empty tags should be present in an invoice, as far as I understand, but I can't find the reference right now