Editor: Fix post editor layout when Post Content has no attributes.

Changes output of `wp_get_post_content_block_attributes` to return null if Post Content block doesn’t exist or empty array if it has no attributes.

Props flixos90, mukesh27.
Fixes #59358.


git-svn-id: https://develop.svn.wordpress.org/trunk@56629 602fd350-edb4-49c9-b593-d223f7449a82

tests/phpunit/tests/blocks/editor.php

@@ -446,14 +446,20 @@ class Tests_Blocks_Editor extends WP_UnitTestCase {
 				'type' => 'constrained',
 			),
 		);
-		// With no block theme, expect an empty array.
-		$this->assertSame( array(), wp_get_post_content_block_attributes() );
+		// With no block theme, expect null.
+		$this->assertNull( wp_get_post_content_block_attributes() );
 
 		switch_theme( 'block-theme' );
 
 		$this->assertSame( $attributes_with_layout, wp_get_post_content_block_attributes() );
 	}
 
+	public function test_wp_get_post_content_block_attributes_no_layout() {
+		switch_theme( 'block-theme-post-content-default' );
+
+		$this->assertSame( array(), wp_get_post_content_block_attributes() );
+	}
+
 	/**
 	 * @ticket 53458
 	 */
@@ -527,6 +533,19 @@ class Tests_Blocks_Editor extends WP_UnitTestCase {
 		switch_theme( WP_DEFAULT_THEME );
 	}
 
+	/**
+	 * @ticket 59358
+	 */
+	public function test_get_block_editor_settings_without_post_content_block() {
+
+		$post_editor_context = new WP_Block_Editor_Context( array( 'post' => get_post() ) );
+
+		$settings = get_block_editor_settings( array(), $post_editor_context );
+
+		$this->assertArrayNotHasKey( 'postContentAttributes', $settings );
+
+	}
+
 	/**
 	 * @ticket 52920
 	 * @expectedDeprecated block_editor_settings

tests/phpunit/tests/theme/themeDir.php

@@ -185,6 +185,7 @@ class Tests_Theme_ThemeDir extends WP_UnitTestCase {
 			'Block Theme [0.4.0]',
 			'Block Theme [1.0.0] in subdirectory',
 			'Block Theme Deprecated Path',
+			'Block Theme Post Content Default',
 			'Block Theme with defined Typography Fonts',
 			'Empty `fontFace` in theme.json - no webfonts defined',
 			'A theme with the Update URI header',