The Wishlist Item Counter is hidden when the Wishlist is Empty. However some merchants might want to display the value 0 (Zero) for empty wishlist instead of hiding it. The below method helps in achieving this.
Open the Extra CSS tool under App’s Settings in Shopify Admin at the below location
Apps =>> Smart Wishlist =>> Configure Appearance =>> Extra CSS
Add the below CSS code to the 1st Code box of Extra CSS tool.
span.topbadge:empty{
display: inline-block !important;
}
span.topbadge:empty:before {
content: "0";
}