No sites for tabular view within isotope domain

[johanvonboer]

"map"-type request, which yields a number of sites in Japan:

{
   "facetsConfig":{
      "requestId":1,
      "requestType":"populate",
      "domainCode":"isotope",
      "targetCode":"sites",
      "triggerCode":"sites",
      "facetConfigs":[
         {
            "facetCode":"sites",
            "position":1,
            "picks":[
               
            ],
            "textFilter":""
         }
      ]
   },
   "resultConfig":{
      "requestId":1,
      "sessionId":"1",
      "viewTypeId":"map",
      "aggregateKeys":[
         "site_level"
      ]
   }
}

The same "tabular"-type request yields zero results:

{
   "facetsConfig":{
      "requestId":2,
      "requestType":"populate",
      "domainCode":"isotope",
      "targetCode":"sites",
      "triggerCode":"sites",
      "facetConfigs":[
         {
            "facetCode":"sites",
            "position":1,
            "picks":[
               
            ],
            "textFilter":""
         }
      ]
   },
   "resultConfig":{
      "requestId":2,
      "sessionId":"1",
      "viewTypeId":"tabular",
      "aggregateKeys":[
         "site_level"
      ]
   }
}

As a sidenote, what is the difference between these two? They seems to do the same thing and return the same data (normally), why do we need to differentiate them?