Administration: Don't attempt to send a notification about a change of site admin or network admin email address when the old address is empty.

Props spenserhale.

Fixes #62211

git-svn-id: https://develop.svn.wordpress.org/trunk@60129 602fd350-edb4-49c9-b593-d223f7449a82

Author: johnbillion

src/wp-includes/functions.php

@@ -8090,8 +8090,8 @@ function wp_cache_set_last_changed( $group ) {
 function wp_site_admin_email_change_notification( $old_email, $new_email, $option_name ) {
 	$send = true;
 
-	// Don't send the notification to the default 'admin_email' value.
-	if ( '[email protected]' === $old_email ) {
+	// Don't send the notification to the default 'admin_email' value or an empty value.
+	if ( '[email protected]' === $old_email || empty( $old_email ) ) {
 		$send = false;
 	}
 

src/wp-includes/ms-functions.php

@@ -2869,8 +2869,8 @@ function update_network_option_new_admin_email( $old_value, $value ) {
 function wp_network_admin_email_change_notification( $option_name, $new_email, $old_email, $network_id ) {
 	$send = true;
 
-	// Don't send the notification to the default 'admin_email' value.
-	if ( '[email protected]' === $old_email ) {
+	// Don't send the notification to the default 'admin_email' value or an empty value.
+	if ( '[email protected]' === $old_email || empty( $old_email ) ) {
 		$send = false;
 	}