Scoped onMissingMethod variables to ARGUMENTS

We're looking at locking down our Railo instance with some of the stricter code options that Railo provides. In fixing our implicit variable access, I came across these couple lines of code, too.

**I know this isn't the way I'm supposed to contribute.**

I'm supposed to mail in a contributor agreement and provide a bug report with unit tests and all that. I'm hoping this minor change can slip in anyway.