Sometimes meaningless <nowiki> tags appear in edited pages - they have no actual content, and only some formatting. For example, you can see a useless '''''<nowiki/>''''' in this edit.
Such <nowiki> tags should be auto-discarded whenever possible.
(Also discussed at https://www.mediawiki.org/wiki/Talk:Parsoid/Normalizations#An_empty_nowiki_tag_without_anything_at_the_end_of_the_line )