🐾🎵 Prevent app crash when footnotes do not exist

[rowanc1]

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[changeset-bot]

🦋 Changeset detected

Latest commit: b2d0e3e

The changes in this PR will be included in the next version bump.

This PR includes changesets to release 14 packages

Name	Type
myst-to-react	Patch
@myst-theme/providers	Patch
@myst-theme/frontmatter	Patch
@myst-theme/diagrams	Patch
@myst-theme/jupyter	Patch
@myst-theme/site	Patch
@myst-theme/styles	Patch
@myst-theme/common	Patch
@myst-theme/icons	Patch
@myst-theme/search	Patch
@myst-theme/search-minisearch	Patch
@myst-theme/book	Patch
@myst-theme/article	Patch
myst-demo	Patch

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