uselessly and wrong - empty relation objects included

[gilfanovrrPaker]

type userJSONAPI struct {
	ID string `jsonapi:"primary,user"`
	Cards []*card `jsonapi:"relation,cards"`
}
type projectJSONAPI struct {
	ID string `jsonapi:"primary,project"`
}
type card struct {
	ID          string `jsonapi:"primary,card"`
	Title       string `jsonapi:"attr,title"`
	Description string `jsonapi:"attr,description"`
	URL         string `jsonapi:"attr,url"`
	Project     *projectJSONAPI `jsonapi:"relation,project"`
}

{  
   "data":{  
      "type":"user",
      "id":"DaevDM",
      "relationships":{  
         "cards":{  
            "data":[  
               {  
                  "type":"card",
                  "id":"5oxQSz6BKdy4bGhC6"
               },
               {  
                  "type":"card",
                  "id":"Dw27dBAzKZfaQYEqk"
               }
            ]
         }
      }
   },
   "included":[  
      {  
         "type":"card",
         "id":"Dw27dBAzKZfaQYEqk",
         "attributes":{ 
             "description":"",
            "title":"111",
            "url":"/b/33e72d7f-72ea-4b55-a9b5-df7e6659b2cb/14.2/Dw27dBAzKZfaQYEqk" },
         "relationships":{  
            "project":{  
               "data":{  
                  "type":"project",
                  "id":"14.2"
               }
            }
         }
      },
      {  
         "type":"card",
         "id":"5oxQSz6BKdy4bGhC6",
         "attributes":{  
            "description":"",
            "title":"222",
            "url":"/b/6c22c755-c517-4a72-ba94-c85713a5487b/14.3/5oxQSz6BKdy4bGhC6"
         },
         "relationships":{  
            "project":{  
               "data":{  
                  "type":"project",
                  "id":"14.3"
               }
            }
         }
      },      
      {  
         "type":"project",
         "id":"14.3"
      },
      {  
         "type":"project",
         "id":"14.2"
      }
   ]
}

Included contains empty objects ("project" has no attributes).
The emberjs considers the object fully filled (but it is just empty) and will not fill by next data request.