Check to see if we have an author before displaying it. See #9948.

git-svn-id: http://svn.automattic.com/wordpress/trunk@11471 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/default-widgets.php

@@ -823,9 +823,11 @@ function wp_widget_rss_output( $rss, $args = array() ) {
 		$author = '';
 		if ( $show_author ) {
 			$author = $item->get_author();
+			if ( is_object($author) ) {
 				$author = $author->get_name();
 				$author = ' <cite>' . esc_html( strip_tags( $author ) ) . '</cite>';
 			}
+		}
 
 		if ( $link == '' ) {
 			echo "<li>$title{$date}{$summary}{$author}</li>";