[BugFix] Configurable products > Variants > Attributes are empty

[misha-kotov]

Preconditions (*)

1. Magento 2.3
2. Sample data

Steps to reproduce (*)

Query

{
  products(filter: {sku: {eq: "WP13"}}) {
    items {
      name
      image
      ... on ConfigurableProduct {
        sku
        variants {
          attributes {
            label
            code
            value_index
          }
          product{
            sku
          }
        }
      }
    }
  }
}

Expected result (*)

1. Attributes of variants are not empty

Actual result (*)

{
  "data": {
    "products": {
      "items": [
        {
          "name": "Portia Capri",
          "image": "/w/p/wp13-orange_main_3.jpg",
          "sku": "WP13",
          "variants": [
            {
              "attributes": [],
              "product": {
                "sku": "WP13-28-Blue"
              }
            },
            {
              "attributes": [],
              "product": {
                "sku": "WP13-28-Green"
              }
            },
            {
              "attributes": [],
              "product": {
                "sku": "WP13-28-Orange"
              }
            },
            {
              "attributes": [],
              "product": {
                "sku": "WP13-29-Blue"
              }
            },
            {
              "attributes": [],
              "product": {
                "sku": "WP13-29-Green"
              }
            },
            {
              "attributes": [],
              "product": {
                "sku": "WP13-29-Orange"
              }
            }
          ]
        }
      ]
    }
  }
}

[naydav]

#331