[Zope] ZCatalog and multivalued field

[Yurj]

Use Keyword index.

Be careful that if the search field is emprty, that index return nothing
(empty result) instead of all result.

So I had to use a different name in the form and check if it is empty. If
so, I copy it in the REQUEST with the right name.

Hope there's a better solution :)

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