[8.19] Fix NPE in flat_bbq scorer when all vectors are missing (#129548) #129624
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It is possible to get all the way down to the knn format reader and there be no vectors in the index. This execution path is possible if utilizing nested queries (which bypasses the higher level checks in `KnnFloatVectorQuery#approximateSearch`). bbq_flat should check for the existence of vectors before attempting to create the scorer. (cherry picked from commit 80667d0)
benwtrent
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