Meetup API returns empty JSON

[frankV]

The Meetup API will occasionally return an empty JSON, so we either need to cache it more aggressively, or store a successful response in database as a fallback.

[svvitale]

@frankV what do you think about using a simple module variable for fallback (i.e. store the last successful result as a module variable)? If the issue is truly intermittent and somewhat rare, it seems like doing the work to put it in the database is overkill.

[frankV]

Yea I agree. we can cache it longer too, I switched us to: http://pythonhosted.org/Flask-Caching/