Settings: Replace `count()` call with `empty()` in `get_settings_errors()` to prevent PHP 7.2 warnings when `$wp_settings_errors` is `null`.

Props pross, dd32, westonruter.
See #40109.
Fixes #42498 for 4.9.

Built from https://develop.svn.wordpress.org/branches/4.9@42147


git-svn-id: http://core.svn.wordpress.org/branches/4.9@41978 1a063a9b-81f0-0310-95a4-ce76da25c4cd

wp-admin/includes/template.php

@@ -1457,8 +1457,9 @@ function get_settings_errors( $setting = '', $sanitize = false ) {
 	}
 
 	// Check global in case errors have been added on this pageload.
-	if ( ! count( $wp_settings_errors ) )
+	if ( empty( $wp_settings_errors ) ) {
 		return array();
+	}
 
 	// Filter the results to those of a specific setting if one was set.
 	if ( $setting ) {

wp-includes/version.php

@@ -4,7 +4,7 @@
  *
  * @global string $wp_version
  */
-$wp_version = '4.9-RC2-42145';
+$wp_version = '4.9-RC2-42147';
 
 /**
  * Holds the WordPress DB revision, increments when changes are made to the WordPress DB schema.