The isset broke when we defined the var to fix E_ALL warnings, making the leading raquo appear on homepages.

git-svn-id: https://develop.svn.wordpress.org/trunk@4357 602fd350-edb4-49c9-b593-d223f7449a82

wp-includes/general-template.php

@@ -206,7 +206,7 @@ function wp_title($sep = '»', $display = true) {
 	}
 
 	$prefix = '';
-	if ( isset($title) )
+	if ( !empty($title) )
 		$prefix = " $sep ";
 
 	$title = $prefix . $title;