Wordpress Visual Editor CRLF Quirk

Adding extra vertical space (eg. carriage return) to postings in WordPress can be a pain. While there might be a plugin to fix the issue, learned by searching around that using the code:

<br class="blank" />

When in HTML mode will not be deleted by the visual mode processor. So if you flip back and forth between the two input modes, that code appears to be safe from being removed.