店铺的所有商品。
该 object 可以在所有模版内使用。单独使用该 object 不会产生输出，需配合 get filter 一起使用。
传入商品 handle，返回对应的 product object。
{{#var product = all_products | get("earring-ab001") /}}{{#link_to product.url}} {{product.title}}{{/link_to}}
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