Fixed parse_message_line error

[nitzanfarhi]

When the code in parser.py:70 is called:

 commit['message'] = "\n".join(
        parse_message_line(msgline)
        for msgline in
        parts['message'].splitlines()
    )

and parse_message_line is returned as None, and exception is thrown.
The solution was simple, swap None with newline.

[tarmstrong]

I haven't looked at this code in over a decade but as far as I can tell there shouldn't be an exception due to Nones getting filtered out here: https://github.com/tarmstrong/git2json/blob/master/git2json/parser.py#L79

Do you have an example exception?

[nitzanfarhi]

It seems like I have an older version, I'll use the master instead of pip. Thanks :)