Tokenizer creates Doctype with empty string name; possibly should be null; breaks tests.

[1619digital]

When the tokenizer matches a doctype token, it creates a current token with a name "" (empty string) - the publicId, systemId are set to None. This happens in method markupDeclarationOpenState.

I'm not sure there's any reason for this, but it breaks all the tests, which expect a nameless Doctype to have a null name.

Most, but not all, of the relevant tests are in file test3.test in the tokenizer test directory.

[gsnedders]

html5lib/html5lib-tests#13 was the change to the tests.

https://github.com/gsnedders/html5lib-python/tree/update-to-pass-tests is a start on fixing it.