Product descriptions not displaying when product has variations

I just upgraded my version of Marketpress from to after migrating to a new server which is running PHP7 upgraded from 5.4. For some reason, on individual product pages for which the product has variations (e.g. the product description was NOT showing up at the bottom of the page, regardless of whether or not either of the variations were selected.

I was able to fix the problem by commenting out lines 950-952 of marketpress/includes/common/class-mp-product.php but I'm worried what other repercussions that might have for the rest of the site.

To be clear, in all cases the different variations still have the same description, so I'm not sure why the MP_Product::content() function tries to get the content of a variation.

Can you shed any light on this? Thanks!