Index: includes/class-wp-list-table.php
===================================================================
--- includes/class-wp-list-table.php	(revisione 38811)
+++ includes/class-wp-list-table.php	(copia locale)
@@ -656,7 +656,7 @@
 
 		// No comments at all.
 		if ( ! $approved_comments && ! $pending_comments ) {
-			printf( '<span aria-hidden="true">—</span><span class="screen-reader-text">%s</span>',
+			printf( '<span aria-hidden="true"></span><span class="screen-reader-text">%s</span>',
 				__( 'No comments' )
 			);
 		// Approved comments have different display depending on some conditions.
@@ -667,7 +667,7 @@
 				$pending_comments ? $approved_phrase : $approved_only_phrase
 			);
 		} else {
-			printf( '<span class="post-com-count post-com-count-no-comments"><span class="comment-count comment-count-no-comments" aria-hidden="true">%s</span><span class="screen-reader-text">%s</span></span>',
+			printf( '<span class="post-com-count post-com-count-no-comments">&#8212;<span class="comment-count comment-count-no-comments" aria-hidden="true">%s</span><span class="screen-reader-text">%s</span></span>',
 				$approved_comments_number,
 				$pending_comments ? __( 'No approved comments' ) : __( 'No comments' )
 			);