Here is the fixed version of the Linux Idle plugin.
Sorry for the pain it's caused. I emailed this up as well to get it put into the release version.
Thank you Sam Richards for spotting it so quick. This version should work for all languages as well.
Best way to just install this yourself is to drop the .jar into your Spark/plugins directory. Then in your ~/.Spark/plugins remove the directory idlelinux/ and the idlelinux.jar in there. Then restart Spark.
Should be good to go. Reply with any problems you might have.