#209 irclib: Prevent crash if 324 or 329 is not received after any other post-join messages.

[Valentin Lorentz]

Hi,

A fix for a bug someone experiences on some network.

https://github.com/ProgVal/Limnoria/commit/677f7fdd6fe4d119aa36a468d856d8957601f456

Regards,
Valentin