NullDC crashes on button config menu

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What steps will reproduce the problem?

1: Switch plugins to work with xbox 360 controller (it was working previously, 
so I know it should be working)

2: open the options drop down menu

3: try to open player 1 button configuration menu in port a or whatever

4: Crash

I changed the NullDC.CFG while trying to fix an audio issue, and after that 
none of the games would launch, they all had errors. So I deleted the config, 
and replaced it with a new, vanilla, one. And now games start and play fine, 
but the button config menu crashes each time it's opened.

Original issue reported on code.google.com by [email protected] on 15 Jul 2014 at 10:59