[whatwg/url] New URLSearchParams algorithm does not check if optional init variable is set (#333)

The algorithm definition begins:
> To create a **new** URLSearchParams object, optionally using _init_, run these steps: 

However, the algorithm itself doesn't check to see if _init_ is given before operating on it, going so far as identify its default case as being a string:
> 4. Otherwise, _init_ is a string, then set _query_’s list to the result of parsing _init_.

Steps 2, 3, and 4 should be enclosed in a check for whether _init_ is actually given before attempting to operate on it.

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