[w3c/manifest] When purpose is invalid, return set with "any" instead of undefined. (#515)

@marcoscaceres PTAL :smile: 
You can view, comment on, or merge this pull request online at:

  https://github.com/w3c/manifest/pull/515

-- Commit Summary --

  * When purpose is invalid, return set with "any" instead of undefined (fixes #513).

-- File Changes --

    M index.html (4)

-- Patch Links --

https://github.com/w3c/manifest/pull/515.patch
https://github.com/w3c/manifest/pull/515.diff

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