Handle HTTP errors in Twitch.get_messages()

bot.py

@@ -153,6 +153,8 @@ class TwitchBot(irc.bot.SingleServerIRCBot):
         user_id = config['Twitch'].getint('target_user_id')
         since = dateutil.parser.parse(since).date()
         messages = Twitch(api_url, client_id, log).get_messages(user_id, since)
+        if not messages:
+            return
         for message in messages:
             for pattern, action in self.patterns:
                 m = pattern.match(message)

twitch.py

@@ -47,6 +47,7 @@ class Twitch(object):
         return result
 
     def get_messages(self, user_id, since):
+        try:
             videos = self._get_videos(user_id)
             result = []
             for video in [v for v in videos if v['date'] >= since]:
@@ -54,4 +55,9 @@ class Twitch(object):
                     self.log.info('Processing VOD %d (%s)', video['id'], video['title'])
                 comments = self._get_comments(video['id'])
                 result.extend(comments)
+        except requests.exceptions.HTTPError as e:
+            if self.log:
+                self.log.error('Failed to retrieve VOD messages: %s', str(e))
+            return None
+        else:
             return result