Bug: io.open fails on empty file name

[Jonne Ransijn <yoyoyonny@...>]

Steps to reproduce:

1.    Create program containing: io.open("", "")

2.    Execute program

Expected result:

error: file name cannot be empty

Actual result:

crash: lua.exe doesn't react

NB: I couldn't find a actual bug report platform, and my experience with the mailing list has learnt me that there aren't many bug reports here. I hope this is the right place; http://www.lua.org/faq.html#2.3 wasn't very specific.