Bug#434329: mail-notification: crashes on startup

[Fabiano Manoel de Andrade]

  Hi.
  I have the same problem here. With the following messages:
~$ mail-notification

(mail-notification:3727): GLib-GObject-WARNING **: specified instance size
for type `MNGMimeStreamVFS' is smaller than the parent type's `GMimeStream'
instance size

(mail-notification:3727): GLib-GObject-WARNING **: cannot retrieve class for
invalid (unclassed) type `<invalid>'

(mail-notification:3727): GLib-GObject-WARNING **: specified instance size
for type `MNGMimeStreamVFS' is smaller than the parent type's `GMimeStream'
instance size

(mail-notification:3727): GLib-GObject-CRITICAL **: g_object_new: assertion
`G_TYPE_IS_OBJECT (object_type)' failed

  Regards.
  Fabiano.