fix a mistake I made before

Seb, I made mistake before and I know why it worked before.
Recently G5K migrated to wheezy and ruby 1.9.

Check this out:

In Ruby 1.8:

>> "node".each { |x| puts x }
node
=> "node"

In Ruby 1.9:

>> "node".each { |x| puts x }
NoMethodError: undefined method `each' for "node":String
	from (irb):1
	from /usr/bin/irb:12:in `<main>'

Oh, how much I hate differences between Ruby 1.8 and 1.9!!!