no feedback when auth token is invalid (expired?)

[pivotal-cloudplanner]

We were trying to deploy with heroku san, and it was hanging with no feedback. When we Ctrl-C'ed, we got this stack trace:

^Crake aborted!

/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/stage.rb:137:in ``'
/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/stage.rb:137:in `auth_token'
/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/stage.rb:20:in `heroku'
/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/stage.rb:80:in `maintenance'
/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/tasks.rb:193:in `block (3 levels) in <top (required)>'
/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/project.rb:63:in `block in each_app'
/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/project.rb:62:in `each'
/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/project.rb:62:in `each_app'
/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/tasks.rb:321:in `each_heroku_app'
/Users/pivotal/.rvm/gems/ruby-1.9.3-p194@portal/gems/heroku_san-4.0.7/lib/heroku_san/tasks.rb:192:in `block (2 levels) in <top (required)>'

We then re-authed with heroku login, and everything started working.