Make sure there's something in the queue at the very beginning.

def _prime_queue(self, init_points):
        """Make sure there's something in the queue at the very beginning."""
        if self._queue.empty and self._space.empty:
            init_points = max(init_points, 1)

        for _ in range(init_points):
            self._queue.add(self._space.random_sample())