title: WooCommerce - When sale price is 0, show only regular price
body: <p>I've been looking for solution on this for ages. I have a WooCommerce website where I do bulk product uploads. Now, from my excel sheet, I have a column for regular price and sale price. For some products without a sale/promo price, the client has replaced it with 0.</p>
  
  <p>After uploading the excel file, I realized that those products with sale price of "0" are showing as "Free". I want a situation when the promo price is 0 or below a specific number, it should only show the regular price instead.</p>