@NotNull
  public String getPresentableError() {
    if (errors == null) {
      return message != null ? message : GithubBundle.message("unknown.loading.error");
    }
    else {
      StringBuilder s = new StringBuilder();
      if (message != null) s.append(message);
      for (Error e : errors) {
        s.append(String.format("<br/>[%s; %s]%s: %s", e.resource, e.field, e.code, e.message));
      }
      return s.toString();
    }
  }
@NotNull
  public String getPresentableError()