Hide "Contents" on pages with multiple TOC trees

[jdknight]

If a document has more than one TOC tree directive and no other headings on the page, an empty "Contents" section is rendered in the sidebar. Adjusting the hide-toc logic to check if all entries in the TOC tree are all local TOC tree entries.

[pradyunsg]

Do you have an example documentation set for me to try before/after on?

(if you could post screenshots, even better)

[jdknight]

Do you have an example documentation set for me to try before/after on?

This documentation with this render (if that helps).