Hello all, NPE in collapse hint=top_fc, When there are no segments, using hint=top_fc in collapse results in NPE.
* query http://localhost:8983/solr/bukken/select?fq={!collapse field=str_field&hint=top_fc}&indent=true&q.op=OR&q=*:*&useParams= * response "error":{ "msg":"Cannot invoke \"org.apache.lucene.index.SortedDocValues.getValueCount()\" because \"this.collapseValues\" is null", "trace":"java.lang.NullPointerException: Cannot invoke \"org.apache.lucene.index.SortedDocValues.getValueCount()\" because \"this.collapseValues\" is null\n\tat org.apache.solr.search.CollapsingQParserPlugin$OrdScoreCollector.<init>(CollapsingQParserPlugin.java:621)\n\tat org.apache.solr.search.CollapsingQParserPlugin$CollectorFactory.getCollector(CollapsingQParserPlugin.java:2125) ..... Has this issue already been discussed? Minami Takuya
