Fix undefined offset
Fix undefined offset

Items in $warnings should either be a string or an array with two values
ghalse/simplesamlphp,simplesamlphp/simplesamlphp,ghalse/simplesamlphp,dnmvisser/simplesamlphp,dnmvisser/simplesamlphp,dnmvisser/simplesamlphp,ghalse/simplesamlphp,simplesamlphp/simplesamlphp,simplesamlphp/simplesamlphp,dnmvisser/simplesamlphp,ghalse/simplesamlphp,simplesamlphp/simplesamlphp