# Description

This PR fixes an issue in articulation object from omni.isaac.lab. The
functions `write_root_com_pose_to_sim` and `write_root_link_to_sim` both
result in an error where a variable is called before being assigned. I
checked and there is a test for this, but I'm not sure why they don't
catch it...

The two functions have been changed to match the behaviors of
`write_root_link_pose_to_sim` and `write_root_com_velocity_to_sim`.



Fixes #1659 

## Type of change

- Bug fix (non-breaking change which fixes an issue)

## Checklist

- [x] I have run the [`pre-commit` checks](https://pre-commit.com/) with
`./isaaclab.sh --format`
- [ ] I have made corresponding changes to the documentation
- [x] My changes generate no new warnings
- [ ] I have added tests that prove my fix is effective or that my
feature works
- [ ] I have updated the changelog and the corresponding version in the
extension's `config/extension.toml` file
- [ ] I have added my name to the `CONTRIBUTORS.md` or my name already
exists there

---------
Co-authored-by: Kelly Guo <kellyg@nvidia.com>