@Nls
  @NotNull
  private static String getErrorMessage(@NotNull Throwable e) {
    String message = e.getMessage();
    return StringUtil.isEmptyOrSpaces(message) ? DiffBundle.message("error.cant.show.diff.message") : message;
  }
@Nls
  @NotNull
  private static String getErrorMessage(@NotNull Throwable e)