Missing a null check in BooleanQuery.toString(String)
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                 Key: LUCENE-1246
                 URL: https://issues.apache.org/jira/browse/LUCENE-1246
             Project: Lucene - Java
          Issue Type: Bug
          Components: Query/Scoring
    Affects Versions: 2.3.1
            Reporter: John Wang


Our queryParser/tokenizer in some situations creates null query and was added 
as a clause to Boolean query.
When we try to log the query, NPE is thrown from log(booleanQuery).

In BooleanQuery.toString(String), a simple null check is overlooked.


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