graying corpus statistic(plus tests+vc test fixed) and fix vc serialization

Change-Id: I3f934c2cc0ebbb0a91b5fa8f529bf3f5c3ebd391
(cherry picked from commit 172d6a4bbc7d29a0fe7c23b114fbbf485e2f4aeb)
diff --git a/dev/js/src/vc/unspecified.js b/dev/js/src/vc/unspecified.js
index 6ffa0e3..416ad85 100644
--- a/dev/js/src/vc/unspecified.js
+++ b/dev/js/src/vc/unspecified.js
@@ -121,6 +121,11 @@
       return this._element;
     },
 
+
+    incomplete : function () {
+      return true;
+    },
+    
     /**
      * Click on the unspecified object
      */