empathy_roster_window_init: don't call set_notebook_page()
empathy_roster_window_init: don't call set_notebook_page()

We should wait for the AM to be prepared (which is done in this function)
before calling set_notebook_page() as it calls
empathy_account_manager_get_accounts_connected() which relies on the AM being
prepared.

https://bugzilla.gnome.org/show_bug.cgi?id=683854

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