Add invalid newsletter scenarios to feature spec
Add invalid newsletter scenarios to feature spec

Newsletters with an invalid user segment should display a warning on
show and index. Also those newsletters should not be sent.

AyuntamientoMadrid/consul,lalibertad/consul,consul/consul,CDJ11/CDJ,AyuntamientoMadrid/participacion,usabi/consul_san_borondon,AyuntamientoPuertoReal/decidePuertoReal,consul/consul,lalibertad/consul,AyuntamientoPuertoReal/decidePuertoReal,AjuntamentdeCastello/consul,AyuntamientoMadrid/participacion,AyuntamientoMadrid/consul,deivid-rodriguez/participacion,deivid-rodriguez/participacion,CDJ11/CDJ,AyuntamientoPuertoReal/decidePuertoReal,CDJ11/CDJ,CDJ11/CDJ,AjuntamentdeCastello/consul,AjuntamentdeCastello/consul,lalibertad/consul,consul/consul,deivid-rodriguez/participacion,deivid-rodriguez/participacion,consul/consul,consul/consul,usabi/consul_san_borondon,lalibertad/consul,AyuntamientoMadrid/consul,AjuntamentdeCastello/consul,AyuntamientoMadrid/participacion,AyuntamientoMadrid/participacion,AyuntamientoMadrid/consul,usabi/consul_san_borondon,usabi/consul_san_borondon