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xml-> returns a variable number of strings, depending on what the predicates match.

When using xml-> to filter XML content, it would be very handy to have xml-> return empty strings when there is no match for the predicates. This allows processing malformed XML more accurately.

I've created an example here:

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Reference: https://clojure.atlassian.net/browse/DZIP-7 (reported by alex+import)