message: [Qt] Fix segfault when running GUI client with --help or -?
diff: @@ -33,7 +33,7 @@ HelpMessageDialog::HelpMessageDialog(QWidget* parent, bool about) : QDialog(pare
  ui(new Ui::HelpMessageDialog)
  {
  ui->setupUi(this);
  - this->setStyleSheet(parent->styleSheet());
  + if (parent) this->setStyleSheet(parent->styleSheet());
  GUIUtil::restoreWindowGeometry("nHelpMessageDialogWindow", this->size(), this);
  QString version = tr("PIVX Core") + " " + tr("version") + " " + QString::fromStdString(FormatFullVersion());
  