No matter how the fields are fed, even if all optional fields are fed, it displays the message "Either Source files, Exec command or both must be supplied", which should disappear as soon as one of the mentionned fields are fed by the user. Everything's working fine but every user that is new to the plugin thinks there's something missing to feed. It also seems a common rule in Jenkins that red messages disappear in real-time as soon as problem is fixed.