From 84e2cccab4320346735e6b10618f3de77a00b7d5 Mon Sep 17 00:00:00 2001
From: Michael Peter Christen <mc@yacy.net>
Date: Sun, 21 Dec 2014 19:08:28 +0100
Subject: [PATCH] fix to prevent assertion error in ranking servlet if no
 vocabularies are present that could be evaluated

---
 htroot/RankingSolr_p.java | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/htroot/RankingSolr_p.java b/htroot/RankingSolr_p.java
index f543fb75a..2bba0a23b 100644
--- a/htroot/RankingSolr_p.java
+++ b/htroot/RankingSolr_p.java
@@ -201,7 +201,7 @@ public class RankingSolr_p {
             prop.putHTML("boosthint_vocabulariesvoclogcounts", voclogcountsFields.toString());
             String[] facetfields = ff.toArray(new String[ff.size()]);
             int fc = 0;
-            try {
+            if (facetfields.length > 0) try {
                 LinkedHashMap<String, ReversibleScoreMap<String>> facets = sb.index.fulltext().getDefaultConnector().getFacets("*:*", 100, facetfields);
                 facets.put(CollectionSchema.vocabularies_sxt.getSolrFieldName(), vokcounts);
                 for (Map.Entry<String, ReversibleScoreMap<String>> facetentry: facets.entrySet()) {