SENSEI-326 Fix NPE in ScoreAugmentQuery (when inner scorer is null) #18
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This appears to be a new bug in Sensei (since 1.6).
In Lucene 4, the scorer method on Weight may return null if the scorer will not match any docs. Thus, a new AugmentScorer should never be created if the inner scorer is null.
https://senseidb.atlassian.net/browse/SENSEI-326