Fix PHP sessions always throwing an exception.
Fix PHP sessions always throwing an exception.

Incorrectly refactored in eb204573214bb2a06d28f824d9b12dd94489d1ce

ghalse/simplesamlphp,simplesamlphp/simplesamlphp,dnmvisser/simplesamlphp,ghalse/simplesamlphp,simplesamlphp/simplesamlphp,dnmvisser/simplesamlphp,simplesamlphp/simplesamlphp,simplesamlphp/simplesamlphp,dnmvisser/simplesamlphp,ghalse/simplesamlphp,dnmvisser/simplesamlphp,ghalse/simplesamlphp