Do not display empty values ​​in product comparison (compare.tpl)?

Question

PHP

If you do not fill in the items weight, dimensions in the product card (admin panel), then when comparing the goods in the corresponding lines there will be zero values.
How to hide a table row if all compared products have zero values?
screenshot
and more on the topic of the compare functionality
split the output of comparing products by product categories, for example. as in citilink.ru
conditionally so as not to compare the sausage and the smartphone, opencart does not make any difference.