ALF-9611 RSOLR 049: Share works against SOLR

- mostly working with bugs raised or the issues found
- ALF-9627 	RSOLR 049: Support for TAG list - simple field facettting
  - was not required. Facetting alpha is there (limits not set and need to go into JSON) - added to result set
- ALF-9628 	RSOLR 049: HTTPClient pooling and sharing by query
  - pooled for query, one reused instance for each tracker (could be shared)
- ALF-9629 	RSOLR 049: Support for PARENT field and start of PATH rebuilding other index tracking (group and site search)
  - done - also started PATH change and returns other data as not yet finished (QNAME is the most obvious)
  - fixed up and tidied query generation for index tokenisation mode form the model and what the query would like

git-svn-id: https://svn.alfresco.com/repos/alfresco-enterprise/alfresco/HEAD/root@29585 c4b6b30b-aa2e-2d43-bbcb-ca4b014f7261

source/java/org/alfresco/repo/search/EmptyResultSet.java

@@ -31,6 +31,7 @@ import org.alfresco.service.cmr.search.ResultSet;
 import org.alfresco.service.cmr.search.ResultSetMetaData;
 import org.alfresco.service.cmr.search.ResultSetRow;
 import org.alfresco.service.cmr.search.SearchParameters;
+import org.alfresco.util.Pair;
 
 /**
  * An empty result set
@@ -148,4 +149,10 @@ public class EmptyResultSet implements ResultSet
     {
         return false;
     }
+    
+    @Override
+    public List<Pair<String, Integer>> getFieldFacet(String field)
+    {
+        return Collections.<Pair<String, Integer>>emptyList();
+    }
 }