fix handling of root modules in setup_paths

node_modules/c9/setup_paths.js

@@ -8,13 +8,14 @@ var oldResolve = modules._resolveFilename;
 var extraPaths = [
     __dirname + "/../../"
 ];
-modules._resolveFilename = function(request, paths) {
+modules._resolveFilename = function(request, parent) {
+    if (!parent) parent = { paths: [], filename: "" };
     // Ensure client extensions can be loaded
     request = request.replace(/^lib\//, "node_modules/");
     // Add the extra paths
     extraPaths.forEach(function(p) {
-        if(paths.paths.indexOf(p) === -1)
-            paths.paths.push(p);
+        if (parent.paths.indexOf(p) === -1)
+            parent.paths.push(p);
     });
-    return oldResolve(request, paths);
+    return oldResolve(request, parent);
 };