Bundler: Fix IOException trying to scan an invalid path.

VAR.WebFormsCore/Code/Bundler.cs

@@ -50,6 +50,12 @@ public class Bundler
                 return _absoluteFiles;
             }
 
+            if (Directory.Exists(_absolutePath) == false)
+            {
+                _absoluteFiles = new List<string>();
+                return _absoluteFiles;
+            }
+            
             DirectoryInfo dir = new DirectoryInfo(_absolutePath);
             FileInfo[] files = dir.GetFiles();
             _absoluteFiles = files.OrderBy(file => file.FullName).Select(file2 => file2.FullName).ToList();