If a recent cache exists, return it, else return None

def _get_feed_cache(self):
        """If a recent cache exists, return it, else return None"""
        feed_cache = None
        if os.path.exists(self._feed_cache_file):
            maxage = datetime.now() - timedelta(minutes=self._cachetime)
            file_ts = datetime.fromtimestamp(os.stat(self._feed_cache_file).st_mtime)
            if file_ts > maxage:
                try:
                    with open(self._feed_cache_file, 'rb') as cache:
                        feed_cache = cache.read()
                finally:
                    pass
        return feed_cache