* **units:** Use better conversion factor for feet ([d1b4938](https://github.com/ladybug-tools/ladybug-rhino/commit/d1b4938f339435133944d8a3815f581f1defaa20))
* **visset:** Refactor VisualizationSet methods to make them rusable ([2b8304b](https://github.com/ladybug-tools/ladybug-rhino/commit/2b8304b85c3ab7135756eb7ad33f3796fc02603e))
* **visset:** Catch the case of None Rhino units ([b330aa7](https://github.com/ladybug-tools/ladybug-rhino/commit/b330aa7a26b2031b5ad1db315636b789e3ea43db))