Issue #1450714 by getgood: ATOM parser ignores 'updated' tag

libraries/common_syndication_parser.inc

@@ -201,7 +201,19 @@ function _parser_common_syndication_atom10_parse($feed_XML) {
     $item['title'] = _parser_common_syndication_title($title, $body);
     $item['description'] = $body;
     $item['author_name'] = $original_author;
-    $item['timestamp'] = _parser_common_syndication_parse_date(isset($news->published) ? "{$news->published}" : "{$news->issued}");
+
+    // Fall back to updated for timestamp if both published and issued are
+    // empty.
+    if (isset($news->published)) {
+      $item['timestamp'] = _parser_common_syndication_parse_date("{$news->published}");
+    }
+    elseif (isset($news->issued)) {
+       $item['timestamp'] = _parser_common_syndication_parse_date("{$news->issued}");
+    }
+    elseif (isset($news->updated)) {
+      $item['timestamp'] = _parser_common_syndication_parse_date("{$news->updated}");
+    }
+
     $item['url'] = trim($original_url);
     if (valid_url($item['url']) && !valid_url($item['url'], TRUE) && !empty($base)) {
       $item['url'] = $base . $item['url'];