Create default contstructor for serialization

Change-Id: Id21367b5fab38946f88dfee1a58d97eee0c0a0fc
diff --git a/core/store/dist/src/main/java/org/onosproject/store/resource/impl/ContinuousResourceAllocation.java b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/ContinuousResourceAllocation.java
index f9e22dd..b7c988d 100644
--- a/core/store/dist/src/main/java/org/onosproject/store/resource/impl/ContinuousResourceAllocation.java
+++ b/core/store/dist/src/main/java/org/onosproject/store/resource/impl/ContinuousResourceAllocation.java
@@ -40,6 +40,12 @@
         this.allocations = allocations;
     }
 
+    // for serializer
+    private ContinuousResourceAllocation() {
+        this.original = null;
+        this.allocations = null;
+    }
+
     /**
      * Checks if there is enough resource volume to allocated the requested resource
      * against the specified resource.