We have a 728X90 banner in our site. For some countries we don't have a banner to display and from some reason the DFP still holds the empty space.
How can we configure it to only occupy the space if a banner is displayed?
You need to use the collapseEmptyDivs
method.
You can read more about it here: https://support.google.com/dfp_premium/answer/3072674?hl=en