Crash on using null as ImperativeTest.test options

[muturgan]

This code works correctly:

const mt = require('metatests');
mt.test('Name', testFunc); // or even mt.test('Name', testFunc, undefinde);

but in this case:

const mt = require('metatests');
// for example I want to pass the fourth arg (runner) as d.ts allows me
mt.test('Name', testFunc, null);

I get the following error

TypeError: Cannot read property 'todo' of null