Meta description is empty
This means that the URL in question has a meta description that is empty.
Why is this important?
The meta description is considered important to help users quickly understand what content they can expect to find on the page, when clicking through from the search engine results page. Well written meta descriptions typically achieve a better click-through-rate.
If the meta description is empty, this represents a missed optimization opportunity. Furthermore, this means that search engines will write the meta description for you, sometimes with pretty disastrous results (example below shows a page on our site with no meta description set...).
What does the Hint check?
This Hint will trigger for any internal URL that has a meta description but with no value.
Examples that trigger this Hint
This Hint will trigger for any URL that has an empty meta description in the <head>:
Why is this Hint marked 'Potential Issue'?
This Hint is a 'Potential Issue', which means that it is unlikely to be affecting the site at the moment, but should be investigated as it could cause issues in the future.
Meta descriptions have no impact on SEO, however they do have an impact on CTR from search results, so in general it is a good idea to set them.
However, in some situations, or for certain sets of pages, you may feel that it is not a good use of resources to write a meta description for every single page.