Added checks to the arguments of empathy_message_equal.
Added checks to the arguments of empathy_message_equal.

Signed-off-by: Jonny Lamb <jonny.lamb@collabora.co.uk>

svn path=/trunk/; revision=2604

Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets,GNOME/telepathy-account-widgets,Distrotech/telepathy-account-widgets,GNOME/telepathy-account-widgets