Bugfix: hide Self link in included resources for missing controller

[bart-degreed]

Bugfix: hide Self link in included resources when there's no registered controller for it. Before, it would use the controller URL from the current request in the Self link, which is wrong.

Example response from GET /photoLocations, assuming PhotoAlbumsController does not exist:

{
  "data": {
    "type": "photoLocations"
    ...
  },
  "included": [
    {
      "type": "photoAlbums",
      },
      "relationships": {
        "photos": {
          "links": {
            "self": "http://localhost/photoLocations/e8467a26-a8d8-4ba4-934c-646c26dd6ebd/relationships/photos",
            "related": "http://localhost/photoLocations/e8467a26-a8d8-4ba4-934c-646c26dd6ebd/photos"
          }
        }
      }
      "links": {
        "self": "http://localhost/photoLocations/7e15ef84-0182-4fb4-805f-62b1e8f8a6e1" // <-- WRONG
      }
    }
  ]
}

After the fix:

{
  "data": {
    "type": "photoLocations"
    ...
  },
  "included": [
    {
      "type": "photoAlbums",
      },
      "relationships": {
        "photos": {
          "links": {
            "self": "http://localhost/photoLocations/e8467a26-a8d8-4ba4-934c-646c26dd6ebd/relationships/photos",
            "related": "http://localhost/photoLocations/e8467a26-a8d8-4ba4-934c-646c26dd6ebd/photos"
          }
        }
      }
    }
  ]
}

QUALITY CHECKLIST

• Changes implemented in code
• Complies with our contributing guidelines
• Adapted tests
• N/A: Documentation updated

[codecov]

Codecov Report

Merging #1141 (ab67c86) into master (bc5fbe0) will increase coverage by 0.00%.
The diff coverage is 100.00%.

@@           Coverage Diff           @@
##           master    #1141   +/-   ##
=======================================
  Coverage   89.46%   89.46%           
=======================================
  Files         242      242           
  Lines        7211     7213    +2     
=======================================
+ Hits         6451     6453    +2     
  Misses        760      760           

Impacted Files	Coverage Δ
...piDotNetCore/Serialization/Response/LinkBuilder.cs	98.31% <100.00%> (+0.02%)	⬆️

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