NameError: name 'os' is not defined in scale_lidar_io

[BeckerFelix]

This bug doesn't affect this library, but it affects scale_lidar_io.

When callingscene.get_frame(frame_id).save() from scale_lidar_io/frame.py:460, it raises a NameError at

        # Save frame
        with open(os.path.join(path, "frame-%s.json" % self.id), "w") as file:
            file.write(self.to_json(base_url))

because os is not imported.

scale-lidar-io.                      0.1.165
scale-lidar-io-debug                 0.2.0
scaleapi.                            2.9.0