There are some few differences:

In Zope4 exceptions are callable, but we don't want to call them here,
so we use a python: expression instead of the path expression which
tries to call error_value.

error_message is sometimes not passed.

The context is different: Since Zope 4, the `standard_error_message` is
rendered in the context of REQUEST['PUBLISHED'], which in case of
publishing a skin (page template or script) in the context of a document
is is the skin itself, but for error rendering in case of erp5_web Web
Site or Web Section, we expect standard_error_message_template to always
be rendered in the context of the document, that's why we use
REQUEST.PARENTS[0] as context.

  REQUEST.PUBLISHED = <PythonScript at /erp5/script used for /erp5/module/document>
  REQUEST.PARENTS [<Document>, <Module>, <ERP5Site>, ...]

In case of redirect, the body is no longer empty, but we explicitly
return an empty body to keep the same behavior as zope2