updated build

dist/vis.js

@@ -5,7 +5,7 @@
  * A dynamic, browser-based visualization library.
  *
  * @version 3.7.2-SNAPSHOT
- * @date    2014-12-02
+ * @date    2014-12-03
  *
  * @license
  * Copyright (C) 2011-2014 Almende B.V, http://almende.com
@@ -23698,7 +23698,7 @@ return /******/ (function(modules) { // webpackBootstrap
             this.bind(key,callback,type);
           }
         }
-      }
+      };
 
       // get the key label from an event
       this.getKey = function(event) {
@@ -23728,10 +23728,12 @@ return /******/ (function(modules) { // webpackBootstrap
         }
         if (callback !== undefined) {
           var newBindings = [];
-          var bound = _bound[type][_keys[key].code]
-          for (var i = 0; i < bound.length; i++) {
-            if (!(bound[i].fn == callback && bound[i].shift == _keys[key].shift)) {
-              newBindings.push(_bound[type][_keys[key].code][i]);
+          var bound = _bound[type][_keys[key].code];
+          if (bound !== undefined) {
+            for (var i = 0; i < bound.length; i++) {
+              if (!(bound[i].fn == callback && bound[i].shift == _keys[key].shift)) {
+                newBindings.push(_bound[type][_keys[key].code][i]);
+              }
             }
           }
           _bound[type][_keys[key].code] = newBindings;