An empty anchor should return empty strings for its getters #843
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document.createElement('a').host or .href or .. should return an empty string.
However, URL.constructor(document.createElement('a')) should fail.
Because HTMLAnchorElement uses URL.constructor, we have the wrong behavior.
This adds a guard for an empty anchor. This might not cover all of the cases which are valid for an anchor but invalid for a URL.constructor, but it's the most common.