Collapsing empty div elements

[rmetente]

Expected Behavior

When ad slots don't get filled, the empty divs should collapse by default.

Actual Behavior

Divs that are used by ads slots that don't get filled, do not collapse. These divs introduce blank spaces in the layout.

Steps to Reproduce the Behavior

Catch an ad slot that does not deliver creative, or schedule a slot to deliver an empty creative.

Additional Comments

Further details for implementation can be found here:
https://support.google.com/admanager/answer/3072674?hl=en

Desired default behavior for instances when ad slots get filled most of the time:
Add googletag.pubads().collapseEmptyDivs(); to the portion of your page to collapse a particular div only when an ad doesn't serve to its ad slot. If a slot isn't filled, the div collapses, possibly moving the page content up with it and reflowing the page.