message: Check if found folder is not null when loading fragments
  When loading fragments, check if the public folder is not null first
  Closes
diff: @@ -485,6 +485,8 @@ void CascadiaSettings::_LoadFragmentExtensions()
  // So we use another mutex and condition variable
  auto foundFolder = _extractValueFromTaskWithoutMainThreadAwait(ext.GetPublicFolderAsync());
  + if (foundFolder)
  + {
  // the StorageFolder class has its own methods for obtaining the files within the folder
  // however, all those methods are Async methods
  // you may have noticed that we need to resort to clunky implementations for async operations
  @@ -504,6 +506,7 @@ void CascadiaSettings::_LoadFragmentExtensions()
  }
  }
  }
  +}
  // Method Description:
  // - Helper function to apply json stubs in the local app data folder and the global program data folder
  