Description:
------------
If any body passed to imap_mail_compose() is an empty array or not
an array at all, the function leaks the already allocated
envelope.

Test script:
---------------
<?php
imap_mail_compose([], []);
imap_mail_compose([], [1]);
?>


Expected result:
----------------
no memory leaks


Actual result:
--------------
Detected memory leaks!
Dumping objects ->
{45190} normal block at 0x0000024F8D53F120, 136 bytes long.
 Data: <                > 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00
Object dump complete.