Steps to reproduce:
1. Duplicate a device configuration line, or have no configured devices
2. Start capture
3. wait for agent to report capabilities
Workaround (if any):
Per http://opencast.3480289.n2.nabble.com/JIRA-Ticket-Cleanup-proposal-td7475080.html, this has been bulk resolved as won't fix. If this is still important to you please reopen and we can triage as appropriate.