## PR Description

This PR fixes #7798

The problem was that in three places where truthy/falsy checks were
being used instead of explicit undefined checks:

### Expected Outcome:

Now when you test in the Vega Editor with height/width: 0, it should
respect that setting instead of falling back to the default height of
300.

<details>
  <summary><h2>Checklist</h2></summary>

- [ ] This PR is atomic (i.e., it fixes one issue at a time).
- [ ] The title is a concise [semantic commit
message](https://www.conventionalcommits.org/) (e.g. "fix: correctly
handle undefined properties").
- [ ] `npm test` runs successfully
- For new features:
  - [ ] Has unit tests.
  - [ ] Has documentation under `site/docs/` + examples.

Tips:

-
https://medium.com/@greenberg/writing-pull-requests-your-coworkers-might-enjoy-reading-9d0307e93da3
is a nice article about writing a nice PR.
- Use draft PR for work in progress PRs / when you want early feedback
(https://github.blog/2019-02-14-introducing-draft-pull-requests/).
</details>

---------

Co-authored-by: Dominik Moritz <domoritz@gmail.com>

Internal version of #9647

---------

Co-authored-by: Bas Broekhuizen <bas.broekhuizen@gmail.com>
Co-authored-by: GitHub Actions Bot <vega-actions-bot@users.noreply.github.com>

Update all dependencies including Vega.

---------

Co-authored-by: GitHub Actions Bot <vega-actions-bot@users.noreply.github.com>