Return 1 from get_comment_pages_count() when pagination is disabled.

props obenland.
fixes #17778.

Built from https://develop.svn.wordpress.org/trunk@25126


git-svn-id: http://core.svn.wordpress.org/trunk@25106 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/comment.php

@@ -789,6 +789,9 @@ function get_comment_pages_count( $comments = null, $per_page = null, $threaded
 	if ( empty($comments) )
 		return 0;
 
+	if ( ! get_option( 'page_comments' ) )
+		return 1;
+
 	if ( !isset($per_page) )
 		$per_page = (int) get_query_var('comments_per_page');
 	if ( 0 === $per_page )