Do not warning if we try to load the avatar of a contact that does not yet have its id.
Do not warning if we try to load the avatar of a contact that does not yet have its id.

svn path=/trunk/; revision=1129

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