'added_to_cart' event does not upload a product's categories

[BruceKristelijn]

The "add_to_cart" event is called in two ways:

• Inserted into the javascript code because the page refreshes.
• Javascript event: "added_to_cart".

The JS Event however misses the product categories:

[BruceKristelijn]

The reason this happens is because of this: var product_category = $thisbutton.data('category');

The button does not contain the required information. This information can be retrieved from the parent "li" element.