--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/toolkit/javascript/d3/src/core/selection-empty.js	Thu Apr 10 14:20:23 2014 +0200
@@ -0,0 +1,3 @@
+d3_selectionPrototype.empty = function() {
+  return !this.node();
+};