empathy-chat: show pending messages only for the first set of logs
empathy-chat: show pending messages only for the first set of logs

Fixes: https://bugzilla.gnome.org/639877

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