Fix not-guaranteed-to-be-defined td global
Fix not-guaranteed-to-be-defined td global

This only showed up in 1 of our 4 or 5 example projects
(webpack) and it wasn't obvious that the root cause was 
the source listing referencing td.

How the heck do I test for this global not to be set when
all the tests set it?? Ughhhhhhh
testdouble/testdouble.js,testdouble/testdouble.js,testdouble/testdouble.js