go-tour/gotour: fix bug in argument handling Don't use the default after going to all that trouble to override it. Mea culpa.
go-tour/gotour: fix bug in argument handling
Don't use the default after going to all that trouble to override it.
Mea culpa.

R=adg
CC=golang-dev
https://codereview.appspot.com/13638043

golang-tr/go-tour-tr,golang-tr/go-tour-tr