Blows up if did not find value in key value store from lucene search provider

[garyluoex]

java.lang.NullPointerException: null
        at java.util.TreeMap.put(TreeMap.java:563)
        at java.util.TreeSet.add(TreeSet.java:255)
        at java.util.stream.ReduceOps$3ReducingSink.accept(ReduceOps.java:169)
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
        at java.util.stream.ReferencePipeline$3$1.accept(ReferencePipeline.java:193)
        at java.util.Spliterators$ArraySpliterator.forEachRemaining(Spliterators.java:948)
        at java.util.stream.AbstractPipeline.copyInto(AbstractPipeline.java:481)
        at java.util.stream.AbstractPipeline.wrapAndCopyInto(AbstractPipeline.java:471)
        at java.util.stream.ReduceOps$ReduceOp.evaluateSequential(ReduceOps.java:708)
        at java.util.stream.AbstractPipeline.evaluate(AbstractPipeline.java:234)
        at java.util.stream.ReferencePipeline.collect(ReferencePipeline.java:499)
        at com.yahoo.bard.webservice.data.dimension.impl.LuceneSearchProvider.getResultsPage(LuceneSearchProvider.java:726)
        at com.yahoo.bard.webservice.data.dimension.impl.LuceneSearchProvider.findAllDimensionRowsPaged(LuceneSearchProvider.java:215)
        at com.yahoo.bard.webservice.web.endpoints.DimensionsServlet.getDimensionRows(DimensionsServlet.java:302)```