Upgrade/Install: Avoid creating nonce during installation.

When installing and using database-saved salts, wp_create_nonce() causes database errors as wp_salt() attempts to insert into the not-yet-created options table. Since authentication isn't available during installation, we can safely skip creating a nonce.

Props nullvariable, pento, dd32, rmccue.
Merges [39684] to the 4.7 branch.
Fixes #39047.

Built from https://develop.svn.wordpress.org/branches/4.7@39697


git-svn-id: http://core.svn.wordpress.org/branches/4.7@39637 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-includes/script-loader.php

@@ -507,7 +507,7 @@ function wp_default_scripts( &$scripts ) {
 	$scripts->add( 'wp-api', "/wp-includes/js/wp-api$suffix.js", array( 'jquery', 'backbone', 'underscore' ), false, 1 );
 	did_action( 'init' ) && $scripts->localize( 'wp-api', 'wpApiSettings', array(
 		'root'          => esc_url_raw( get_rest_url() ),
-		'nonce'         => wp_create_nonce( 'wp_rest' ),
+		'nonce'         => ( wp_installing() && ! is_multisite() ) ? '' : wp_create_nonce( 'wp_rest' ),
 		'versionString' => 'wp/v2/',
 	) );
 

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.7.1-alpha-39696';
+$wp_version = '4.7.1-alpha-39697';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.