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/docgroup.js b/dev/js/src/vc/docgroup.js
index 7ce2fed..10a6495 100644
--- a/dev/js/src/vc/docgroup.js
+++ b/dev/js/src/vc/docgroup.js
@@ -356,7 +356,7 @@
     toQuery : function (brackets) {
       var list = this._operands
 	        .filter(function (op) {
-	          return op.ldType() !== 'non';
+            return !op.incomplete();
 	        })
 	        .map(function (op) {
 	          return (op.ldType() === 'docGroup') ?