Don't fail if creating graph directory fails

Author: BHoggs

src/Authentication/Authentication/Common/GraphSessionInitializer.cs

@@ -30,7 +30,13 @@ internal static GraphSession CreateInstance(IDataStore dataStore = null)
         {
             IGraphOption graphOptions = null;
             // Try to create directory if it doesn't exist.
-            Directory.CreateDirectory(Core.Constants.GraphDirectoryPath);
+            try 
+            {
+                Directory.CreateDirectory(Core.Constants.GraphDirectoryPath);
+            }
+            finally
+            {
+            }
             if (File.Exists(Constants.GraphOptionsFilePath))
             {
                 // Deserialize the JSON into the GraphOption instance