Blocks: Reverse the logic when checking the `pre_render_block` result.

We should be returning if the result isn't null, not when it is.

See #45451.


Built from https://develop.svn.wordpress.org/trunk@44555


git-svn-id: http://core.svn.wordpress.org/trunk@44386 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/blocks.php

@@ -184,7 +184,7 @@ function render_block( $block ) {
 	 * @param array  $block      The block being rendered.
 	 */
 	$pre_render = apply_filters( 'pre_render_block', null, $block );
-	if ( is_null( $pre_render ) ) {
+	if ( ! is_null( $pre_render ) ) {
 		return $pre_render;
 	}
 

wp-includes/version.php

@@ -13,7 +13,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '5.1-alpha-44554';
+$wp_version = '5.1-alpha-44555';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.