Report empty article as empty.

ios/chrome/browser/dom_distiller/distiller_viewer.cc

Index: ios/chrome/browser/dom_distiller/distiller_viewer.cc
diff --git a/ios/chrome/browser/dom_distiller/distiller_viewer.cc b/ios/chrome/browser/dom_distiller/distiller_viewer.cc
index a0bd94ab33f1f85bdf72d8163c7e06f943d71308..46a26ab3f414557283108f3ffd69000c9e89fa85 100644
--- a/ios/chrome/browser/dom_distiller/distiller_viewer.cc
+++ b/ios/chrome/browser/dom_distiller/distiller_viewer.cc
@@ -39,13 +39,14 @@ DistillerViewer::~DistillerViewer() {}
 void DistillerViewer::OnArticleReady(
     const dom_distiller::DistilledArticleProto* article_proto) {
   DomDistillerRequestViewBase::OnArticleReady(article_proto);
-  if (article_proto->pages_size() > 0) {
+  bool is_empty = article_proto->pages_size() == 0 ||
+                  article_proto->pages(0).html().empty();
+  if (!is_empty) {
     std::vector<ImageInfo> images;
     for (int i = 0; i < article_proto->pages(0).image_size(); i++) {
       auto image = article_proto->pages(0).image(i);
       images.push_back(ImageInfo{GURL(image.url()), image.data()});
     }
-
     const std::string html = viewer::GetUnsafeArticleTemplateHtml(
         url_.spec(), distilled_page_prefs_->GetTheme(),
         distilled_page_prefs_->GetFontFamily());