Fixed KQ view to correctly update session

Change-Id: I045455ec2a03f35e58a2de5d32e69d6fa6ea3919
diff --git a/dev/js/src/panel/result.js b/dev/js/src/panel/result.js
index a572180..978a1b6 100644
--- a/dev/js/src/panel/result.js
+++ b/dev/js/src/panel/result.js
@@ -45,8 +45,8 @@
 
         // On close, remove session info on KQ
         this._kq.onClose = function () {
-          this._opened['kq'] = undefined;
-        };
+          delete this._opened['kq'];
+        }.bind(this);
 
         this._opened['kq'] = true;
         this.add(this._kq);