DirectoryTaxonomyWriter should throw a proper exception if it was closed
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                 Key: LUCENE-3579
                 URL: https://issues.apache.org/jira/browse/LUCENE-3579
             Project: Lucene - Java
          Issue Type: Improvement
          Components: modules/facet
            Reporter: Shai Erera
            Assignee: Shai Erera
            Priority: Minor
             Fix For: 3.5, 4.0


DirTaxoWriter may throw random exceptions (NPE, Already Closed - depend on what 
API you call) after it has been closed/rollback. We should detect up front that 
it is already closed, and throw AlreadyClosedException.

Also, on LUCENE-3573 Doron pointed out a problem with DTW.rollback -- it should 
call close() rather than refreshReader. I will fix that as well in this issue.

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