Bug 834760: Null-check mAttachedWidgetListener. r=mwu

widget/xpwidgets/PuppetWidget.cpp

@@ -263,8 +263,6 @@ PuppetWidget::DispatchEvent(nsGUIEvent* event, nsEventStatus& aStatus)
 
   aStatus = nsEventStatus_eIgnore;
 
-  NS_ABORT_IF_FALSE(mAttachedWidgetListener, "No listener!");
-
   if (event->message == NS_COMPOSITION_START) {
     mIMEComposing = true;
   }
@@ -288,7 +286,9 @@ PuppetWidget::DispatchEvent(nsGUIEvent* event, nsEventStatus& aStatus)
     break;
   }
 
-  aStatus = mAttachedWidgetListener->HandleEvent(event, mUseAttachedEvents);
+  if (mAttachedWidgetListener) {
+    aStatus = mAttachedWidgetListener->HandleEvent(event, mUseAttachedEvents);
+  }
 
   if (event->message == NS_COMPOSITION_END) {
     mIMEComposing = false;