#46: Better API failover

# What did I do 

Catch the BadResponseException thrown by Meetup when your API key has not sufficient rights for getting an attendence list. In the view an extra check is put in so the emtpy list is converted to an array (and giving an error for not being one)

# How does it look

On the homepage the attendes from past meetings is ommitted. Also see attached image.

![screenshot from 2014-11-22 14 34 21](https://cloud.githubusercontent.com/assets/522691/5154315/e8d8dbfa-7255-11e4-99ce-4c9a19d32cfa.png)

Typo in 'use' and the first comma doesn't seem necessary.
Also, could you add PHPDoc for this method specifying the return type and some explanation about why there might be a difference?