JaroWinklerDistance returns 0f when s1.length()=s2.length()=0
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Key: LUCENE-2827
URL: https://issues.apache.org/jira/browse/LUCENE-2827
Project: Lucene - Java
Issue Type: Bug
Components: contrib/spellchecker
Affects Versions: 4.0
Environment: JDK1.6.17
Reporter: tom liu
StringDistance sd = new JaroWinklerDistance();
System.out.println(sd.getDistance("",""));
console prints 0.
but when use LevensteinDistance or NGramDistance, that console prints 1.0
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