Handle null or empty page normalized string.

chrome/browser/resources/print_preview/previewarea/preview_area.js

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 cr.define('print_preview', function() {
   'use strict';
 
   /**
    * Creates a PreviewArea object. It represents the area where the preview
    * document is displayed.
@@ skipping 549 matching lines @@
      * consequence of scrolling or zooming the plugin. Updates the custom
      * margins component if shown.
      * @private
      */
     onPreviewVisualStateChange_: function() {
       if (this.isPluginReloaded_) {
         this.zoomLevel_ = this.plugin_.getZoomLevel();
         this.pageOffset_ = new print_preview.Coordinate2d(
             this.plugin_.pageXOffset(), this.plugin_.pageYOffset());
       }
-      var normalized = this.plugin_.getPageLocationNormalized().split(';');
+      var pageLocationNormalizedStr = this.plugin_.getPageLocationNormalized();
+      if (!pageLocationNormalizedStr) {
+        return;
+      }
+      var normalized = pageLocationNormalizedStr.split(';');
       var pluginWidth = this.plugin_.getWidth();
       var pluginHeight = this.plugin_.getHeight();
       var translationTransform = new print_preview.Coordinate2d(
           parseFloat(normalized[0]) * pluginWidth,
           parseFloat(normalized[1]) * pluginHeight);
       this.marginControlContainer_.updateTranslationTransform(
           translationTransform);
       var pageWidthInPixels = parseFloat(normalized[2]) * pluginWidth;
       this.marginControlContainer_.updateScaleTransform(
           pageWidthInPixels / this.printTicketStore_.pageSize.width);
       this.marginControlContainer_.updateClippingMask(
           new print_preview.Size(
               pluginWidth - this.plugin_.getVerticalScrollbarThickness(),
               pluginHeight - this.plugin_.getHorizontalScrollbarThickness()));
     }
   };
 
   // Export
   return {
     PreviewArea: PreviewArea
   };
 });