Made regexps generated for empty character classes ("[]" and "[^]") work in IE.
Made regexps generated for empty character classes ("[]" and "[^]") work in IE.

jlturner/pegjs,pegjs/pegjs,wwall/pegjs-fn,Mingun/pegjs,Mingun/pegjs,crguezl/pegjs,pegjs/pegjs,Sciumo/pegjs,jlturner/pegjs,mcanthony/pegjs,Sciumo/pegjs,mcanthony/pegjs,luisvt/pegjs,GerHobbelt/pegjs,wwall/pegjs-fn,luisvt/pegjs,GerHobbelt/pegjs,crguezl/pegjs