TypeError running on seemingly-sane puppet file

[deltamualpha]

running puppet-lint on https://github.com/ajjahn/puppet-samba/blob/master/manifests/server/ads.pp causes a TypeError crash. By chopping out various bits of the file and re-running, I've isolated it down to this line: https://github.com/ajjahn/puppet-samba/blob/master/manifests/server/ads.pp#L55

Full stacktrace, if helpful:
/Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/plugins/check_whitespace.rb:115:in []': no implicit conversion from nil to integer (TypeError)
from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/plugins/check_whitespace.rb:115:in block (2 levels) in check' from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/plugins/check_whitespace.rb:111:in each'
from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/plugins/check_whitespace.rb:111:in each_with_index' from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/plugins/check_whitespace.rb:111:in block in check'
from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/plugins/check_whitespace.rb:95:in each' from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/plugins/check_whitespace.rb:95:in check'
from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/checkplugin.rb:21:in run' from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/checks.rb:58:in block in run'
from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/checks.rb:56:in each' from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/checks.rb:56:in run'
from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint.rb:168:in run' from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/bin.rb:59:in block in run'
from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/bin.rb:56:in each' from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/lib/puppet-lint/bin.rb:56:in run'
from /Library/Ruby/Gems/2.0.0/gems/puppet-lint-1.1.0/bin/puppet-lint:7:in <top (required)>' from /usr/bin/puppet-lint:23:in load'
from /usr/bin/puppet-lint:23:in <main>'

[rodjek]

Dupe of #409