Fix return value of NotFound middleware.
Fix return value of NotFound middleware.

rjclardy/pakyow,jphager2/pakyow,karimmtarek/pakyow,jphager2/pakyow,karimmtarek/pakyow,rjclardy/pakyow,karimmtarek/pakyow,jenalgit/pakyow,jphager2/pakyow,jenalgit/pakyow