rebuild is an automatic way to : open, edit, save EVERY post

but for 50 posts, is it worth it? that has to be your call.

if you do it, i'd suggest a pre-backup, then fire it off, watch Monday nite football.. come back..

note: you can always kill it in the middle, if you see it taking too much longer than anticipated too..

bummer is, that it starts the rebuild from lower post numbers ( older ) and finishes with the higher ones ( most recent ), so you really won't be doing anything of value until the last maybe 5% of your posts, where those blanks exist.

you'll have to decide for yourself.