Editor: Check that `attrs` is an array in `WP_Block_Supports::apply_block_supports()`.

This prevents a fatal error in `wp_apply_custom_classname_support()`, which expects an array data type for block attributes, and makes sure the block editor can still load if there is a mistake in the attributes of a block.

Follow-up to [54498].

Props caercam.
Fixes #61151.
Built from https://develop.svn.wordpress.org/trunk@58112


git-svn-id: http://core.svn.wordpress.org/trunk@57577 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-block-supports.php

@@ -103,7 +103,7 @@ class WP_Block_Supports {
 			return array();
 		}
 
-		$block_attributes = array_key_exists( 'attrs', self::$block_to_render )
+		$block_attributes = array_key_exists( 'attrs', self::$block_to_render ) && is_array( self::$block_to_render['attrs'] )
 			? self::$block_to_render['attrs']
 			: array();
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.6-alpha-58111';
+$wp_version = '6.6-alpha-58112';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.