accounts_widget_generic_setup: continue iterating when treating optional param in simple mode
accounts_widget_generic_setup: continue iterating when treating optional param in simple mode

We may have more non-optional parameters later.

https://bugzilla.gnome.org/show_bug.cgi?id=677465

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