How to prevent the white variation image from showing up in woocommerce variable products?

By default, when creating a variable product, Woocommerce displays the first thumbnail as a blank image if no image is loaded for the variation (see the poorly highlighted image below). Instead of having to select the same image for each size variation, I would like to leave it blank and simply display the image gallery for the variable product.

To summarize, how can the first miniature be hidden if a size is selected in the product's pull-down menu and it does not have a variation image? As far as I know, there is no supplement that accomplishes this.

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