Products without image

Hi,

I have just installed this plugin and I am trying to find the way to hide the image on some products. I thought not adding the image was enough but appears a default icon instead. On those products I want to show just the description.
On plugin settings, presentation tab >> see thumbnails, I marked as “No” but still the default icon is shown.
Is there any solution to this?

Thank you.

https://wordpress.org/plugins/wp-e-commerce/