Clean up/tweak code - Magento compare list

Hello people, I have a small project to do. On our Magento website which is about to be released a have a slight issue with the compare page for products. We have a lot of products so we try to re-use attribute sets as much as possible. But sometimes attributes are not used for certain products and for other they are. In case an attribute has no value it's is hidden on the product page and also on the product compare list. This works fine. But on the compare view my table is not showing correctly when one item has a value for a certain attribute and the other hasn't. Probably only some fine tuning of the code is necessary. Attached an image of what goes wrong. Anyone who can fix this?