[whatwg/dom] DOMTokenList shouldn't add empty attributes (#488)

Fixes #462.
You can view, comment on, or merge this pull request online at:

  https://github.com/whatwg/dom/pull/488

-- Commit Summary --

  * DOMTokenList shouldn't add empty attributes

-- File Changes --

    M dom.bs (15)

-- Patch Links --

https://github.com/whatwg/dom/pull/488.patch
https://github.com/whatwg/dom/pull/488.diff

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