[Block Library - Site Logo]: Return nothing if logo is not set (#31513)

* Return if no custom logo is set.

* Comment the early return.

* Update packages/block-library/src/site-logo/index.php

Co-authored-by: Carolina Nymark <myazalea@hotmail.com>

Co-authored-by: Carolina Nymark <myazalea@hotmail.com>
Co-authored-by: Nik Tsekouras <ntsekouras@outlook.com>

packages/block-library/src/site-logo/index.php

@@ -22,8 +22,13 @@ function render_block_core_site_logo( $attributes ) {
 	};
 
 	add_filter( 'wp_get_attachment_image_src', $adjust_width_height_filter );
+
 	$custom_logo = get_custom_logo();
 
+	if ( empty( $custom_logo ) ) {
+		return ''; // Return early if no custom logo is set, avoiding extraneous wrapper div.
+	}
+
 	if ( ! $attributes['isLink'] ) {
 		// Remove the link.
 		$custom_logo = preg_replace( '#<a.*?>(.*?)</a>#i', '\1', $custom_logo );