Fix crash in Script Bubble View when images fail to load.

chrome/browser/ui/views/script_bubble_view.cc

 // 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.
 
 #include "chrome/browser/ui/views/script_bubble_view.h"
 
 #include "base/utf_string_conversions.h"
 #include "chrome/browser/extensions/extension_service.h"
 #include "chrome/browser/extensions/extension_system.h"
 #include "chrome/browser/extensions/image_loader.h"
@@ skipping 168 matching lines @@
       layout->AddPaddingRow(0, kPaddingBetweenRows);
       height_ += kPaddingBetweenRows;
     }
   }
 
   layout->Layout(this);
 }
 
 void ScriptBubbleView::OnImageLoaded(size_t index,
                                      const gfx::Image& image) {
-  const gfx::ImageSkia* image_skia = image.ToImageSkia();
-  entries_[index].extension_imageview->SetImage(image_skia);
+  if (!image.IsEmpty()) {
+    const gfx::ImageSkia* image_skia = image.ToImageSkia();
+    entries_[index].extension_imageview->SetImage(image_skia);
+  }
 }
 
 ScriptBubbleController* ScriptBubbleView::GetScriptBubbleController() {
   extensions::TabHelper* extensions_tab_helper =
       extensions::TabHelper::FromWebContents(web_contents_);
   return extensions_tab_helper->script_bubble_controller();
 }