Fix bug # 47927: crash loading 2nd ftp URL. r=waterson

suite/common/directory/directory.js

@@ -63,13 +63,14 @@ function Init()
 
     // Note: Add the HTTPIndex datasource into the tree
     var tree = document.getElementById('tree');
+    tree.database.AddDataSource(HTTPIndex.DataSource);
 
     // Note: set encoding BEFORE setting "ref" (important!)
     var RDF = Components.classes["component://netscape/rdf/rdf-service"].getService();
     if (RDF)    RDF = RDF.QueryInterface(Components.interfaces.nsIRDFService);
     if (RDF)
     {
-        var httpDS = RDF.GetDataSource("rdf:httpindex");
+        var httpDS = HTTPIndex.DataSource;
         if (httpDS) httpDS = httpDS.QueryInterface(Components.interfaces.nsIHTTPIndex);
         if (httpDS)
         {

suite/common/directory/directory.xul

@@ -36,7 +36,7 @@
 
   <script src="chrome://communicator/content/directory/directory.js"></script>
 
-  <tree id="tree" datasources="rdf:files rdf:httpindex" flex="1" style="height:0px;"
+  <tree id="tree" datasources="rdf:files" flex="1" style="height:0px;"
       container="true" open="true"
       ondraggesture="return BeginDragTree(event);">
       <template>