Manually init template registry and controller for non-block themes (#50507)

* Manually init template registry and cotnroller when get_query_template returns nothing

* Add changefile(s) from automation for the following project(s): woocommerce

* Validate template before including it

* Move class registration to init method

* Remove container registration from coming soon handler

* Lint

* Moved registration to register_dependencies

* Change blocks init condition to only when it's not initialized

---------

Co-authored-by: github-actions <github-actions@github.com>
Co-authored-by: Adrian Duffell <9312929+adrianduffell@users.noreply.github.com>
Co-authored-by: Ilyas Foo <foo.ilyas@gmail.com>

plugins/woocommerce/changelog/50507-update-fix-empty-template

@@ -0,0 +1,4 @@
+Significance: patch
+Type: fix
+Comment: Manually initialize block template registry and controller for non-block themes.
+

plugins/woocommerce/src/Blocks/Domain/Bootstrap.php

@@ -132,18 +132,6 @@ class Bootstrap {
 				$is_store_api_request = wc()->is_store_api_request();
 
 				if ( ! $is_store_api_request && ( wc_current_theme_is_fse_theme() || current_theme_supports( 'block-template-parts' ) ) ) {
-					$this->container->register(
-						BlockTemplatesRegistry::class,
-						function () {
-							return new BlockTemplatesRegistry();
-						}
-					);
-					$this->container->register(
-						BlockTemplatesController::class,
-						function () {
-							return new BlockTemplatesController();
-						}
-					);
 					$this->container->get( BlockTemplatesRegistry::class )->init();
 					$this->container->get( BlockTemplatesController::class )->init();
 				}
@@ -448,6 +436,18 @@ class Bootstrap {
 				return new QueryFilters();
 			}
 		);
+		$this->container->register(
+			BlockTemplatesRegistry::class,
+			function () {
+				return new BlockTemplatesRegistry();
+			}
+		);
+		$this->container->register(
+			BlockTemplatesController::class,
+			function () {
+				return new BlockTemplatesController();
+			}
+		);
 	}
 
 	/**

plugins/woocommerce/src/Internal/ComingSoon/ComingSoonRequestHandler.php

@@ -2,6 +2,9 @@
 namespace Automattic\WooCommerce\Internal\ComingSoon;
 
 use Automattic\WooCommerce\Admin\Features\Features;
+use Automattic\WooCommerce\Blocks\BlockTemplatesController;
+use Automattic\WooCommerce\Blocks\BlockTemplatesRegistry;
+use Automattic\WooCommerce\Blocks\Package as BlocksPackage;
 
 /**
  * Handles the template_include hook to determine whether the current page needs
@@ -48,13 +51,21 @@ class ComingSoonRequestHandler {
 		// A coming soon page needs to be displayed. Don't cache this response.
 		nocache_headers();
 
+		$is_fse_theme         = wc_current_theme_is_fse_theme();
+		$is_store_coming_soon = $this->coming_soon_helper->is_store_coming_soon();
+
+		if ( ! $is_fse_theme && ! current_theme_supports( 'block-template-parts' ) ) {
+			// Initialize block templates for use in classic theme.
+			BlocksPackage::init();
+			$container = BlocksPackage::container();
+			$container->get( BlockTemplatesRegistry::class )->init();
+			$container->get( BlockTemplatesController::class )->init();
+		}
+
 		add_theme_support( 'block-templates' );
 
 		$coming_soon_template = get_query_template( 'coming-soon' );
 
-		$is_fse_theme         = wc_current_theme_is_fse_theme();
-		$is_store_coming_soon = $this->coming_soon_helper->is_store_coming_soon();
-
 		if ( ! $is_fse_theme && $is_store_coming_soon ) {
 			get_header();
 		}
@@ -66,7 +77,9 @@ class ComingSoonRequestHandler {
 			}
 		);
 
-		include $coming_soon_template;
+		if ( ! empty( $coming_soon_template ) && file_exists( $coming_soon_template ) ) {
+			include $coming_soon_template;
+		}
 
 		if ( ! $is_fse_theme && $is_store_coming_soon ) {
 			get_footer();