[imp] problem with pgp (Undefined variable: pgp_part)

[Roman Gavrilov]

when selecting "PGP sign /Encrypt message" options from the compose 
window next error occures when
trying to send an email :

*Notice*: Undefined variable: pgp_part in *imp/compose.php* on line *626*

*Fatal error*: Call to undefined function: _setboundary() in 
*/lib/MIME/Part.php* on line *570*

When selecting other options from the pgp select box the mail delivered 
with no problems.