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6f7d65c724
The only case when sesskey is not available is when we came to subscribe.php from a link in email. In that case, we display a confirmation page that redirects back providing the sesskey. All other links to subscribe.php are fixed now so they provide sesskey as a parameter. I also polished $mode parameter handling a bit because the check against empty string was not correct as the value is cast to PARAM_INT.