Index: C:/xampp/htdocs/wordpress_trunk/wp-admin/import/mt.php
===================================================================
--- C:/xampp/htdocs/wordpress_trunk/wp-admin/import/mt.php	(revision 10041)
+++ C:/xampp/htdocs/wordpress_trunk/wp-admin/import/mt.php	(working copy)
@@ -438,8 +438,10 @@
 				$ping->comment_author = $blog;
 			} else {
 				// Processing multi-line field, check context.
-
-				$line .= "\n";
+				
+				if( !empty($line) )
+					$line .= "\n";
+					
 				if ( 'body' == $context ) {
 					$post->post_content .= $line;
 				} else if ( 'extended' ==  $context ) {