selckin created LUCENE-4567:
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Summary: WFSTCompletionLookup.lookup() NPE when empty fst
Key: LUCENE-4567
URL: https://issues.apache.org/jira/browse/LUCENE-4567
Project: Lucene - Core
Issue Type: Bug
Reporter: selckin
Attachments: LUCENE-4567.patch
the fst Builder.finish() returns null when nothing is accepted, this then
results in NPE in lookup(), see patch for extra nullchecks
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