CTools access plugin : Entity reference has value
CTools and Panels is a powerful toolbox for Drupal developers. One of the great features is defining visibility rules for content inserted with panels based on CTools access plugins. My experience is that using the builtin field value check against an empty value does not work. We made a visibility rule to display / not display content when a configurable entity reference field has been filled or not. The visibility settings form Our rule is called “Node: Entity reference defined” and the settings form will show a dropdown list with all entity reference field for nodes.