id	summary	reporter	owner	description	type	status	priority	milestone	component	version	severity	resolution	keywords	cc
8944	MT import causes empty feed	hailin	anonymous	" $line .= ""\n""; L442 in wp-admin/import/mt.php causes an issue in feed: when there is no excerpt, it inserts \n in post_excerpt, and since it's no longer empty, the_excerpt_rss() will return \n, resulting in blank rss <description> entry. 

I think saving \n to db is not very good (although it probably doesn't hurt). 
A safe fix is just to do: 

 if( !empty($line) ) 
    $line .= ""\n""; 

Thanks to sivel for discussions on IRC. 
"	defect (bug)	closed	normal	2.7.1	General		normal	fixed