always create localParams AnyMap when adding facet queries to avoid NPE
diff --git a/core/org.eclipse.smila.solr/code/src/org/eclipse/smila/solr/query/QueryTransformer.java b/core/org.eclipse.smila.solr/code/src/org/eclipse/smila/solr/query/QueryTransformer.java
index 1ceff92..cd4311e 100755
--- a/core/org.eclipse.smila.solr/code/src/org/eclipse/smila/solr/query/QueryTransformer.java
+++ b/core/org.eclipse.smila.solr/code/src/org/eclipse/smila/solr/query/QueryTransformer.java
@@ -357,7 +357,7 @@
private void addFacetQueries(final SolrQuery solrQuery, final AnyMap facet) {
final String attribute = facet.getStringValue(QueryConstants.QUERY);
final AnySeq expression = facet.getSeq(SolrConstants.QUERIES);
- final AnyMap localParams = facet.getMap(SolrConstants.LOCAL_PARAMS);
+ final AnyMap localParams = facet.getMap(SolrConstants.LOCAL_PARAMS, true);
// combine attribute and expression as query
final List<String> queries = new ArrayList<String>();
for (final Any any : expression) {
