Compile master, and run with `src/qt/bitcoin-qt -regtest -nowallet`. As expected, no icon is displayed. Load and unload a wallet. The `HD` icon remains.

On startup:
![on_startup](https://user-images.githubusercontent.com/863730/72410834-711b4c00-37a4-11ea-9a10-bfcf3db7ce68.png)

After a wallet load and unload:
![after_load_unload](https://user-images.githubusercontent.com/863730/72410838-737da600-37a4-11ea-8854-dd13301c0135.png)

default:
            break;
        }
    }
    if (!msgType.isEmpty()) {
        strTitle += " - " + msgType;
    }
    if (style & CClientUIInterface::ICON_ERROR) {
        nMBoxIcon = QMessageBox::Critical;
        nNotifyIcon = Notificator::Critical;
    } else if (style & CClientUIInterface::ICON_WARNING) {
        nMBoxIcon = QMessageBox::Warning;
        nNotifyIcon = Notificator::Warning;
    }
    if (style & CClientUIInterface::MODAL) {
        
        QMessageBox::StandardButton buttons;
        if (!(buttons = (QMessageBox::StandardButton)(style & CClientUIInterface::BTN_MASK)))
            buttons = QMessageBox::Ok;
        showNormalIfMinimized();
        QMessageBox mBox(static_cast<QMessageBox::Icon>(nMBoxIcon), strTitle, message, buttons, this);
        mBox.setTextFormat(Qt::PlainText);
        int r = mBox.exec();
        if (ret != nullptr)
            *ret = r == QMessageBox::Ok;
    } else {
        notificator->notify(static_cast<Notificator::Class>(nNotifyIcon), strTitle, message);
    }
}
void BitcoinGUI::changeEvent(QEvent *e)