compatibility fix for eof? providers that use nil as an equivalent to false
compatibility fix for eof? providers that use nil as an equivalent to false

brianmario/yajl-ruby,tenderlove/yajl-ruby,brianmario/yajl-ruby,sferik/yajl-ruby,brianmario/yajl-ruby,mrkn/yajl-ruby,tenderlove/yajl-ruby,sferik/yajl-ruby,sferik/yajl-ruby