Unknown HTML tags are always printed on their on their own line

[as-op]

<p class='\"op-uc-p\"'>git -b 'task/1023-2' ;&amp; --allow-empty '[<mention class="mention" data-id="37337" data-type="work_package" data-text="#37337">#37337</mention>] 2</p>

Results in needlessly added new lines if the result of handle_unknown_html_tag is [true, opts]