FSO.FolderExists does not throw correct exception

[bobbystacksmash]

This snippet of code is part of the FSO.FolderExists() method which is not throwing the correct WINAPI exception when the dirpath is not a valid type - it throws a node.js exception about .toString() not being defined for dirpath.

if (typeof dirpath !== "string") {
  try {
    dirpath = dirpath.toString();
  }
  catch (e) {
    throw e;
  }
}