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)

{
    
    QString strTitle{PACKAGE_NAME};
    
    int nMBoxIcon = QMessageBox::Information;
    int nNotifyIcon = Notificator::Information;
    bool prefix = !(style & CClientUIInterface::MSG_NOPREFIX);
    style &= ~CClientUIInterface::MSG_NOPREFIX;
    QString msgType;
    if (!title.isEmpty()) {
        msgType = title;
    } else {
        switch (style) {
        case CClientUIInterface::MSG_ERROR:
            msgType = tr("Error");
            if (prefix) message = tr("Error: %1").arg(message);
            break;
        case CClientUIInterface::MSG_WARNING:
            msgType = tr("Warning");
            if (prefix) message = tr("Warning: %1").arg(message);
            break;
        case CClientUIInterface::MSG_INFORMATION:
            msgType = tr("Information");
            
            break;