@Override
  protected List<VcsException> processFiles(final AbstractVcs vcs, final List<? extends FilePath> files) {
    CheckinEnvironment environment = vcs.getCheckinEnvironment();
    if (environment == null) return Collections.emptyList();
    final List<VcsException> result = environment.scheduleMissingFileForDeletion(files);
    if (result == null) return Collections.emptyList();
    return result;
  }
@Override
  protected List<VcsException> processFiles(final AbstractVcs vcs, final List<? extends FilePath> files)