Access undefined $current_user in update_option_new_admin_email().

[Toro_Unit]

in update_option_new_admin_email.

	$content = str_replace( '###USERNAME###', $current_user->user_login, $content );

But undefined value $current_user.

[ocean90]

Thanks for your report and the patch. Introduced/missed in [31403].

[dd32]

+1 looks good to me.

I have a feeling the code was supposed to be using global $current_user originally, but I have no issue with using the helper method instead.

[ocean90]

In 33569:

Multisite mails: Initialize $current_user before accessing $current_user->user_login.

props Toro_Unit.
see #31217.
fixes #33254.