global $post is not set in REST API context

[joemaller]

This is blowing up the editor:

wp-related-posts/src/RelatedPosts.php

Lines 330 to 338 in 0328b07

	global $post;
	$args = is_array($rawArgs) ? $rawArgs : $this->defaults;
	$cleanArgs = [];
	/**
	* Ensure a $post is set and is a valid WP_POST object
	*/
	$cleanArgs['post'] = array_key_exists('post', $args) ? $args['post'] : $post;
	$cleanArgs['post'] = get_post($cleanArgs['post']); // returns a WP_Post or null

Two things need to happen:

• 1. The editor block needs to send the post ID along with weights and post_types
• 2. The library needs to fall back to the most recently published post if nothing is provided.

[joemaller]

improved fallbacks in a2086aa