Generic Push - State is never sent when Idle

[Quentinbri]

Hi,

I use the generic push service and I think there is a small issue with the State information:
The State is only sent when different than 0 but 0 corresponds to Idle. I think this state should always be returned.
Maybe a quick fix would be to delete the line checking if the State is different than 0 in external_push/models.py

Thank you so much for your work on this project, it's awesome ;)