Unit Test Fail to Pass on Node 0.10

[ngiebel]

There is a unit test that is failing currently due to the fact that typeof null is not 'string'. This was partially fixed with the commit a4ef866. I can create a fix for this but I am not sure if the fix should be that null never makes it to the function basePathResolve in config.js or if null should just be ignored in the same manner that undefined was in the commit.