default value added

frontend-js/src/main/js/map/data/Project.js

@@ -381,7 +381,7 @@ Project.prototype.setNotifyEmail = function (notifyEmail) {
 /**
  *
  * @param {DataOverlay} overlay
- * @param {boolean} updateWhenExists
+ * @param {boolean} [updateWhenExists=false]
  */
 Project.prototype.addDataOverlay = function (overlay, updateWhenExists) {
   var overlayToAdd = null;