Fix error if relation empty

Author: listepo

lib/deserializer.js

@@ -15,12 +15,18 @@ module.exports = function Deserializer (data, serverRelations) {
         var fkSuffix = null;
         var fk = null;
         if (_.isArray(clientRelation.data)) {
+          if (_.isEmpty(clientRelation.data)) {
+            return;
+          }
           relationType = _.result(_.find(clientRelation.data, 'type'), 'type');
           relationValue = _.map(clientRelation.data, function (val) {
             return val.id;
           });
           fkSuffix = 'Ids';
         } else {
+          if (clientRelation.data === null) {
+            return;
+          }
           relationType = clientRelation.data.type;
           relationValue = clientRelation.data.id;
           fkSuffix = 'Id';