Selfclosing components in `vue_base.html` break the page

This bug appears at least in Firefox.

In the vue_base.html is a <celery-progress-bottom /> element. If the page is now loaded, the content after this (mainly the footer) will completely disappear (I think vue replaces the whole component during rendering, which includes the rest of the HTML). A page then looks like this:

If you view the source code (not via inspect element), the browser actually reports this as an error:

If we replace the <celery-progress-bottom /> with a <celery-progress-bottom></celery-progress-bottom>, everything works again.