QJsonDocument fails with a confusing error

[Anton Yablokov]

Dear developers,

Consider the following piece of code:

from PyQt5.QtCore import QJsonDocument

json = {
    "catalog": [
        {
            "version": None,
        },
    ]}QJsonDocument(json)

Under Python 3.6+ and PyQt514+ (haven't checked other versions), it results
in the following error at the last line:

TypeError: a value has type 'list' but 'QJsonValue' is expected

QJsonDocument clearly supports lists: QJsonDocument({'a': []}) works fine.

As it turns out, the None value is the reason. Although the docs
<https://doc.qt.io/qt-5/qjsondocument.html#JsonFormat-enum> clearly show
that QJsonDocument supports null values, None is not supported in
PyQt5: QJsonDocument({'a':
None}) results in

TypeError: a value has type 'NoneType' but 'QJsonValue' is expected.

Is it a bug that None is not translated as null? If not, the error message
should be more informative, at least.

Best regards,

Anton
🍏
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