backport (glarose): Gateway update: be more aware of undefined fields for gateway parameters. I don't think this should be an issue, but saw a case where an "undefined value in subtraction" error was being returned; hopefully this will provide some level of protection against that.
Changed paths:
branches/rel-2-3-dev/webwork-modperl/lib/WeBWorK/ContentGenerator/GatewayQuiz.pm