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)

{
    if (!clientModel || !clientModel->getOptionsModel())
        return;
    OptionsDialog dlg(this, enableWallet);
    dlg.setCurrentTab(tab);
    dlg.setModel(clientModel->getOptionsModel());
    dlg.exec();
}
void BitcoinGUI::setNumBlocks(int count, const QDateTime& blockDate, double nVerificationProgress, bool header)
{
#ifdef Q_OS_MAC
    (m_node.isInitialBlockDownload() || m_node.getReindex() || m_node.getImporting()) ? m_app_nap_inhibitor->disableAppNap() : m_app_nap_inhibitor->enableAppNap();
#endif
    if (modalOverlay)
    {
        if (header)
            modalOverlay->setKnownBestHeight(count, blockDate);
        else
            modalOverlay->tipUpdate(count, blockDate, nVerificationProgress);
    }
    if (!clientModel)
        return;
    
    statusBar()->clearMessage();
    
    enum BlockSource blockSource = clientModel->getBlockSource();