diff -r c7c34916027a -r 177826044cd9 wp/wp-includes/customize/class-wp-customize-partial.php
--- a/wp/wp-includes/customize/class-wp-customize-partial.php	Mon Oct 14 18:06:33 2019 +0200
+++ b/wp/wp-includes/customize/class-wp-customize-partial.php	Mon Oct 14 18:28:13 2019 +0200
@@ -159,7 +159,7 @@
 		// Process settings.
 		if ( ! isset( $this->settings ) ) {
 			$this->settings = array( $id );
-		} else if ( is_string( $this->settings ) ) {
+		} elseif ( is_string( $this->settings ) ) {
 			$this->settings = array( $this->settings );
 		}
 
@@ -201,7 +201,7 @@
 		if ( ! empty( $this->render_callback ) ) {
 			ob_start();
 			$return_render = call_user_func( $this->render_callback, $this, $container_context );
-			$ob_render = ob_get_clean();
+			$ob_render     = ob_get_clean();
 
 			if ( null !== $return_render && '' !== $ob_render ) {
 				_doing_it_wrong( __FUNCTION__, __( 'Partial render must echo the content or return the content string (or array), but not both.' ), '4.5.0' );