Allow customizing the no-results behavior of the query block

[aristath]

Came up in #25790
We should allow users to customize the behavior of the query block when no results are found.

[annezazu]

Pulling from the FSE Outreach Program's latest call for testing, wanted to mention this piece of feedback as this issue is considered:

when a Query block has been inserted but is empty (i.e. no post content), markup for the block is still output to the front-end: <ul class=”wp-block-query-loop”></ul>. This will likely also create additional white-space on the front-end, due to a top margin being applied to the <ul> tag.

[ntsekouras]

when a Query block has been inserted but is empty (i.e. no post content), markup for the block is still output to the front-end: <ul class=”wp-block-query-loop”></ul>. This will likely also create additional white-space on the front-end, due to a top margin being applied to the <ul> tag.

Thanks for reporting this @annezazu! I created a small PR to fix this: #29521

[ramonjd]

Here is a duplicate issue, which provide some elaboration on the challenge: #36609

[annezazu]

I am going to close this out with the introduction of @carolinan no results block: #38806 If I missed something, let me know. Happy to reopen.