I would like to use a Matrix Job to release software to Jenkins Master and Slaves. Unfortunately, if any slave is off-line the job never finishes which means it will not run again (at the next release) without manual intervention. I would either like an "on-line slaves only" option, or for something like this to work as a combination filter:

Hudson.instance.getComputer(label == "master"?"":label).getNode().getChannel() != null

The above scriptlet works fine in scriptler, but I cannot seem to get it running (with or without an import) in the combination filter. The combination box will not properly process "import" and without the import "Hudson" is undefined.