Consider empty url case when loading image

third_party/WebKit/Source/core/loader/ImageLoader.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2009, 2010 Apple Inc. All rights
  * reserved.
  *
  * This library is free software; you can redistribute it and/or
  * modify it under the terms of the GNU Library General Public
  * License as published by the Free Software Foundation; either
  * version 2 of the License, or (at your option) any later version.
@@ skipping 310 matching lines @@
   // Make sure to only decrement the count when we exit this function
   std::unique_ptr<IncrementLoadEventDelayCount> load_delay_counter;
   load_delay_counter.swap(delay_until_do_update_from_element_);
 
   Document& document = element_->GetDocument();
   if (!document.IsActive())
     return;
 
   AtomicString image_source_url = element_->ImageSourceURL();
   ImageResourceContent* new_image = nullptr;
-  if (!url.IsNull()) {
+  if (!url.IsNull() && !url.IsEmpty()) {
     // Unlike raw <img>, we block mixed content inside of <picture> or
     // <img srcset>.
     ResourceLoaderOptions resource_loader_options =
         ResourceFetcher::DefaultResourceOptions();
     ResourceRequest resource_request(url);
     if (update_behavior == kUpdateForcedReload) {
       resource_request.SetCachePolicy(WebCachePolicy::kBypassingCache);
       resource_request.SetPreviewsState(WebURLRequest::kPreviewsNoTransform);
     }
 
@@ skipping 377 matching lines @@
   }
   if (delay_until_image_notify_finished_) {
     delay_until_image_notify_finished_->DocumentChanged(
         element_->GetDocument());
   }
   ClearFailedLoadURL();
   ClearImage();
 }
 
 }  // namespace blink