Fixed #1487: DataSet cannot remove an item with id `0` correctly

HISTORY.md

@@ -21,6 +21,9 @@ http://visjs.org
   Thanks @ludost.
 - Fixed support for using a `DataView` in Graph2d. Thanks @ludost.
 
+### DataSet
+- Fixed #1487: DataSet cannot remove an item with id `0` correctly.
+
 
 ## 2015-11-27, version 4.10.0
 

lib/DataSet.js

@@ -704,7 +704,7 @@ DataSet.prototype._remove = function (id) {
   }
   else if (id instanceof Object) {
     var itemId = id[this._fieldId];
-    if (itemId && this._data[itemId]) {
+    if (itemId !== undefined && this._data[itemId]) {
       delete this._data[itemId];
       this.length--;
       return itemId;