toThrow does not catch falsy exceptions

[rbu]

    it("should detect falsy exceptions as thrown", function() {
        expect(function() { throw undefined}).toThrow();
        expect(function() { throw ''}).toThrow();
    });

Currently yields:
Expected function to throw an exception.

[infews]

We track these in our Tracker backlog.

I created this story for this bug.

Thanks for the find!