refs #2174 update name of group only on success

plugins/CoreHome/javascripts/services/piwik-api-service.js

@@ -178,7 +178,7 @@ angular.module('piwikApp.service').factory('piwikApi', function ($http, $q, $roo
             postParams = _postParams_;
         }
 
-        this.fetch(getParams);
+        return this.fetch(getParams);
     };
 
     return piwikApi;

plugins/CoreHome/javascripts/services/websitegroups-service.js

@@ -34,7 +34,8 @@ angular.module('piwikApp.service').service('websiteGroups', function(piwikApi){
             method: 'SitesManager.updateSite',
             idSite: website.idsite,
             group: groupName
+        }).then(function () {
+            website.group = groupName;
         });
-        website.group = groupName;
     }
 });
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