fix error handling in +make-join
fix error handling in +make-join

belisarius222/arvo,ngzax/urbit,ngzax/urbit,belisarius222/arvo,joemfb/arvo,ngzax/urbit,urbit/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit,ngzax/urbit,urbit/urbit,ngzax/urbit,jfranklin9000/urbit,joemfb/arvo,jfranklin9000/urbit,jfranklin9000/urbit,urbit/urbit,ngzax/urbit,jfranklin9000/urbit,jfranklin9000/urbit,urbit/urbit,urbit/urbit,jfranklin9000/urbit,ngzax/urbit