LogRecords are instantiated with `None` for args

[ryan-woo]

Python documentation states that the args for a LogRecord should be a tuple or a dict, seemingly even when there are no args to format in the message. Records created by pyo3-log instead set the args to None.

Records appear to be created here https://github.com/vorner/pyo3-log/blob/main/src/lib.rs#L424.

I am trying to use a handler for LogDNA which fails to emit pyo3-log records because None is not iterable.

[vorner]

Thanks for noticing this. Can you try out the fix in #29, to verify it before I merge and release?

[ryan-woo]

Yes it looks like it is working for me, thanks!

[vorner]

Released as 0.8.3, thank you.