Fix bug due to possible nil venue when retrieved from meetup.

Issue #33

app/models/meetup_event.rb

@@ -15,19 +15,51 @@ class << self
     def all
       json = HTTParty.get("https://api.meetup.com/2/events?&sign=true&photo-host=public&group_id=15138792,12922902,5356052&page=20&key=#{ENV['MEETUP_API_KEY']}").body
       raw_events = JSON.parse(json)['results']
+      raw_events = [] unless raw_events
       events = []
       raw_events.each do |event|
+        venue = create_venue_from_payload(event['venue'])
         events << MeetupEvent.new(
           name: event['name'],
           description: event['description'],
           time: event['time'],
           attendees: event['yes_rsvp_count'],
           address: event['venue']['address_1'],
           venue: event['venue']['name'],
-          url: event['event_url'],
+          url: event['event_url']
         )
       end
       events
     end
+
+    private
+    class NullVenue
+      def address
+        ""
+      end
+      def name
+        "None"
+      end
+    end
+
+    class Venue
+      attr_reader :address, :name
+      def initialize(name: "", address: "")
+        @name = name
+        @address = address
+
+        @address = "" unless @address
+        @name = "None" unless @name
+      end
+    end
+
+    def create_venue_from_payload(venue_hash)
+      return NullVenue.new if venue_hash.nil?
+
+      Venue.new(
+        name: venue_hash["name"],
+        address: venue_hash["address_1"]
+      )
+    end
   end
 end