Fix for directory not existing when getting all files

Author: TechLiam

PackDB.FileSystem/OS/DirectoryProxy.cs

@@ -8,7 +8,7 @@ public class DirectoryProxy : IDirectory
     {
         public string[] GetFiles(string path, string fileExtension)
         {
-            return Directory.GetFiles(path, "*." + fileExtension, SearchOption.TopDirectoryOnly);
+            return Directory.Exists(path) ? Directory.GetFiles(path, "*." + fileExtension, SearchOption.TopDirectoryOnly) : new string[0];
         }
     }
 }