[PR] Avoid NPE in <mappedresources> [ant]

maartenc opened a new pull request, #237:
URL: https://github.com/apache/ant/pull/237

   When the used `<mapper>` in `<mappedresources>` skips a file, this results in a NPE.
   With this change, the file is skipped.
   
   This is the same behavior as with Ant 1.9.x.
   And I think an attempt was made earlier to also fix it, but the `Object.nonNull` call had no effect there, since it's the `String[]` that is null in such a case.
   


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