Query: Prevent PHP notice when `get_post_type_object()` returns `null` in `is_post_type_archive()`.

This changeset avoids potential PHP notices caused by `get_post_type_object()` returning `null` when called inside `is_post_type_archive()`.

Props sean212, costdev.
Fixes #56287.

Built from https://develop.svn.wordpress.org/trunk@54464


git-svn-id: http://core.svn.wordpress.org/trunk@54023 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/class-wp-query.php

@@ -3935,6 +3935,10 @@ class WP_Query {
 		}
 		$post_type_object = get_post_type_object( $post_type );
 
+		if ( ! $post_type_object ) {
+			return false;
+		}
+
 		return in_array( $post_type_object->name, (array) $post_types, true );
 	}
 

wp-includes/version.php

@@ -16,7 +16,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '6.1-beta3-54450';
+$wp_version = '6.1-beta3-54464';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.