You can use the code in the support-tab.js for this:
- html: https://github.com/OpenNebula/one/blob/master/src/sunstone/public/js/plugins/support-tab.js#L224
- event: https://github.com/OpenNebula/one/blob/master/src/sunstone/public/js/plugins/support-tab.js#L680
And use the no_content option:
Hope this helps