Define zero argument contructoris for the serializer

Change-Id: I1c5f4a526f886ffb85b1a9d03d661161f66d076b
diff --git a/core/api/src/main/java/org/onosproject/net/newresource/ContinuousResourceId.java b/core/api/src/main/java/org/onosproject/net/newresource/ContinuousResourceId.java
index 03b634b..5870106 100644
--- a/core/api/src/main/java/org/onosproject/net/newresource/ContinuousResourceId.java
+++ b/core/api/src/main/java/org/onosproject/net/newresource/ContinuousResourceId.java
@@ -46,6 +46,12 @@
         this.name = last.getSimpleName();
     }
 
+    // for serializer
+    ContinuousResourceId() {
+        this.components = ImmutableList.of();
+        this.name = "";
+    }
+
     ImmutableList<Object> components() {
         return components;
     }