==== What is the problem?
Error messages in Parsoid's HTML currently get included in ebooks.
I don't think we can do anything about these errors, but could they not be removed when we are parsing Parsoid output?
==== Steps to reproduce problem
1. https://wsexport.wmflabs.org/?lang=en&page=The_City_of_Dreadful_Night_and_other_poems&format=epub-3&fonts=
2. Go to the last page of content (page 117 for me)
**Observed behavior:** You will see the error `Cite error: <ref> tags exist for a group named "errata", but no corresponding <references group="errata"/> tag was found`
==== Acceptance Criteria
* Investigate bug in in which Parsoid errors display in ebooks and:
** Try to determine the cause of the issue
** Share findings in comment in this ticket
** If possible, issue fix or suggest next steps based on findings
==== Screenshots (if applicable):
Error as it appears in Parsoid (https://en.wikisource.org/api/rest_v1/page/html/The_City_of_Dreadful_Night_and_other_poems%2FThe_City_of_Dreadful_Night):
{F34101538}
Same error as it appears in the epub:
{F34101540}