[Orgmode] Bug/feature : crypt encrypts empty string.

[Richard Riley]

I was just saving a cleaned up org file as a "template" for later
projects when and a crypt region I had just removed magically
reappeared!

e.g

,----
| * Domain
| ** Registrar                                                        :crypt:
| -----BEGIN PGP MESSAGE-----
| Version: GnuPG v1.4.10 (GNU/Linux)
| 
| hQEMA7IjL5SkHG4iAQgAgF/BiEMkhfWuohErZy4TulPtq7Tdh+VEBvLP2Eeehash
| ylHAVOBzfdApVud5ByfzywPm8/fzPDjCNCsdZ3M6sL/IFtoMa6qrNnG4utpYQFxt
| 63Tys9dyEfo7qzbi97LRWrla3DUnJZ3d53PGOg9cxZurq2za3n37xZucFV1HRk7y
| sacLdelZ7CaHd1MxfUQcBQo+H9jbUSdkTCldJ/2csm9aL+/ZuUJJfWL0GbgpzJGg
| liSbn3S2LsobcEw5fh6T4OFlqMWPkyn7xJugMOnA4CwuZtSmmqumye80MW4hE/kX
| TCfRhqrPUuyHNRqxgwiOLZaJan0bueelALnprrWoZ9I7AYmV5UjoV6bIqkVE8rL1
| pLZ/sZE+QzEIpRRzHV6uK1v4BE5SPr5TdA5zA7lBy1UVU2SHnBNJ8K25l6k=
| =eE61
| -----END PGP MESSAGE-----
| 
`----

I removed everything after the Registrar line, and then hit C-x C-s to
save and the crypt block reappeared.

Took me a while to realise that it was probably encrypting
nothing.

Could it not do that or does that behaviour seem ok?