[ONOS-6783] Data type handling in Data Node

Change-Id: I5d27e169f95e2a5af89a866c1d34281201c73c56
diff --git a/serializers/json/src/test/resources/demo1.yang b/serializers/json/src/test/resources/demo1.yang
index f3d8b0c..e3e3fa6 100644
--- a/serializers/json/src/test/resources/demo1.yang
+++ b/serializers/json/src/test/resources/demo1.yang
@@ -10,7 +10,7 @@
                 type string;
             }
             leaf Customs-supervisor {
-                type string;
+                type empty;
                 description "name of the customs-supervisor.";
             }