To replicate:

1. Install the Folders Plugin
2. Install the Campfire Notification plugin and configure
3. Create a new folder
4. Within the folder, create a freestyle job
   1. Add Campfire notification as a post build action
   2. Add 'Execute Shell' with the following (both fail to produce a notification)
      1. echo "hello"
      2. lskdfjlsdkjf

Checking the build log, the notification is never run. There are no related messages in the jenkins log.