Fix Browserify and Webpack partly

[Heath123]

Fixes #7, but not #6 because my fix probably for that isn't the best solution

[ethanent]

This is good. It seems like null is sometimes used as the value for URL.search if a URL without a querystring is parsed using the url.parse method.

I also created a PR to update Node URL module documentation, so we will see what people think: nodejs/node#33849