Merge pull request microsoft#595 from mousetraps/i582

microsoft#582 VS 2013 Crash NullReferenceException

Nodejs/Product/Analysis/Analysis/ModuleTreeExtensions.cs

@@ -28,7 +28,7 @@ internal static IEnumerable<ModuleTree> GetChildrenExcludingNodeModules(this Mod
             // The process of resolving modules can lead us to add entries into the underlying array
             // doing so results in exceptions b/c the array has changed under the enumerable
             // To avoid this, we call .ToArray() to create a copy of the array locally which we then Enumerate
-            return moduleTree.Children.Values.ToArray().Where(mod => !String.Equals(mod.Name, AnalysisConstants.NodeModulesFolder, StringComparison.OrdinalIgnoreCase));
+            return moduleTree.Children.Values.ToArray().Where(mod => mod != null && !String.Equals(mod.Name, AnalysisConstants.NodeModulesFolder, StringComparison.OrdinalIgnoreCase));
         }
     }
 }