Can't build epub of an article without frontmatter

[Oscar Levin]

Or at least I think that is where the bug is.  Using the latest CLI (so some commit in the last two weeks on core), if I try to build epub for a very simple article I get the following error:

* PTX:INFO:   checking all deprecated elements.
* failed to load "/tmp/ptx-eaydxo2j/EPUB/xhtml/table-contents.xhtml": No such file or directory
error: processing with /home/oscar/.ptx/2.45.0/core/xsl/pretext-epub.xsl has failed
Cannot resolve URI /tmp/ptx-eaydxo2j/EPUB/xhtml/table-contents.xhtml

Adding even an empty #frontmatter avoids the error.

[Rob Beezer]

Thanks, Oscar - another oldie, I would guess. Appreciate the debugging, that
was it.

Never thought about this as we moved from converting only #book and expanded
into converting #article. Now on better footing - take it for a drive.

https://github.com/PreTeXtBook/pretext/pull/3077

Thanks,
Rob

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