[BugFix] Fix area for image placeholder in graphql response.

[VitaliyBoyko]

Description (*)

PR for issue #239 Fix resolving of image placeholder for Product without images.
Changed area to pub media instead "graphql" for placeholder asset.

Fixed Issues (if relevant)

1. [BugFix] Fix resolving of image placeholder for Product without images #239: Fix resolving of image placeholder for Product without images

Manual testing scenarios (*)

Request:

{
  products (search: "Test") {
    
    items {
        id
        name
      small_image {
        url
      }
    }
  }
}

Response:

{
  "data": {
    "products": {
      "items": [
        {
          "id": 1201,
          "name": "Test",
          "small_image": {
            "url": "http://graphql-ce.loc/pub/media/catalog/product/cache/74c1057f7991b4edb2bc7bdaa94de933/m/a/magento_image.jpg"
          }
        }
      ]
    }
  }
}

Contribution checklist (*)

• Pull request has a meaningful description of its purpose
• All commits are accompanied by meaningful commit messages
• All new or changed code is covered with unit/integration tests (if applicable)
• All automated tests passed successfully (all builds on Travis CI are green)

[naydav]

@VitaliyBoyko
Contains performance degradation

Query multiple products (Catalog GraphQL): 10.7% (mainline = 28 | team = 31) -> DEGRADATION
Query configurable product (Catalog GraphQL): 18.8% (mainline = 32 | team = 38) -> DEGRADATION
Query bundle product (Catalog GraphQL): 18.2% (mainline = 33 | team = 39) -> DEGRADATION
Query grouped product (Catalog GraphQL): 27% (mainline = 37 | team = 47) -> DEGRADATION

Looks like too many requests to load the same placeholder

[ghost]

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