Introduce unspecification for undefined references in VC builder

Change-Id: I0475ca57db6e45d2d1fcc203ca19d3e577e1bbc5
diff --git a/dev/js/spec/vcSpec.js b/dev/js/spec/vcSpec.js
index 1b1ea01..ef033ab 100644
--- a/dev/js/spec/vcSpec.js
+++ b/dev/js/spec/vcSpec.js
@@ -855,6 +855,7 @@
       expect(vcE.firstChild.firstChild.textContent).toEqual("referTo");
       expect(vcE.firstChild.children[1].getAttribute("data-type")).toEqual("string");
       expect(vcE.firstChild.children.length).toEqual(3);
+      expect(vcE.firstChild.children[1].classList.contains("unspecified")).toBeTruthy();      
     });
   });