Merge pull request #3531 from mantonovic/master

Fix PointerEventHandler exception with Overlay containing SVG and IE9

src/ol/pointer/pointereventhandler.js

@@ -31,6 +31,7 @@
 goog.provide('ol.pointer.PointerEventHandler');
 
 goog.require('goog.array');
+goog.require('goog.dom');
 goog.require('goog.events');
 goog.require('goog.events.BrowserEvent');
 goog.require('goog.events.Event');
@@ -367,7 +368,10 @@ ol.pointer.PointerEventHandler.prototype.enterOver =
  */
 ol.pointer.PointerEventHandler.prototype.contains_ =
     function(container, contained) {
-  return container.contains(contained);
+  if (goog.isNull(contained)) {
+    return false;
+  }
+  return goog.dom.contains(container, contained);
 };