Work around bug in download! during --dry-run.
Work around bug in download! during --dry-run.

When --dry-run is used, download! doesn't return a String, as expected.

x44x45x41x4E/capistrano-mb,x44x45x41x4E/capistrano-mb,mattbrictson/capistrano-mb,m43nu/capistrano-mb,m43nu/capistrano-mb,m43nu/capistrano-mb,mattbrictson/capistrano-mb,x44x45x41x4E/capistrano-mb,mattbrictson/capistrano-mb