How to remove empty tags in rich text? (Redactor or Twig)
I ended up using this solution:

Filter empty tags in Craft/Twig template

{{ entry.houseDescription|replace('/&lt;[^\\/&gt;][^&gt;]*&gt;&lt;\\/[^&gt;]+&gt;/', '')|raw }}



The replace filter /&lt;[^\\/&gt;][^&gt;]*&gt;&lt;\\/[^&gt;]+&gt;/ searches for empty tags and removes them.
The raw filter stops Twig from escaping HTML tags.


Regular expression test (RegExr)