Accept a NULL bundle in hook_entity_bundle_field_info_alter() instead of throwing a TypeError

Problem/Motivation

EntityFieldManager::getFieldDefinitions() does not type its $bundle argument, so a caller passing NULL reaches buildBundleFieldDefinitions() and then this alter hook. The non-nullable string parameter then throws a TypeError.

Steps to reproduce

Try to use Canvas Override with Canvas Tools and the MCP server suite.

Proposed resolution

-  public function entityBundleFieldInfoAlter(array &$fields, EntityTypeInterface $entity_type, string $bundle): void {
+  public function entityBundleFieldInfoAlter(array &$fields, EntityTypeInterface $entity_type, ?string $bundle): void {

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