Noticed this while reviewing #13529, but it's also in master @ 5ba77df15. On macOS 10.13.6:

```
bitcoin-qt -disablewallet
```

<img width="1354" alt="schermafbeelding 2018-08-01 om 16 03 41" src="https://user-images.githubusercontent.com/10217/43526506-b23264d8-95a4-11e8-81a0-5debcad838ae.png">

The usual progress modal doesn't appear when QT starts, and clicking on the progress bar has no effect. It works fine when there's a wallet present.
{
    if (!walletFrame) {
        return;
    }
    WalletView * const walletView = walletFrame->currentWalletView();
    if (!walletView) {
        return;
    }
    WalletModel * const walletModel = walletView->getWalletModel();
    setEncryptionStatus(walletModel->getEncryptionStatus());
    setHDStatus(walletModel->privateKeysDisabled(), walletModel->wallet().hdEnabled());
}
#endif 
void BitcoinGUI::updateProxyIcon()
{
    std::string ip_port;
    bool proxy_enabled = clientModel->getProxyInfo(ip_port);
    if (proxy_enabled) {
        if (labelProxyIcon->pixmap() == 0) {
            QString ip_port_q = QString::fromStdString(ip_port);
            labelProxyIcon->setPixmap(platformStyle->SingleColorIcon(":/icons/proxy").pixmap(STATUSBAR_ICONSIZE, STATUSBAR_ICONSIZE));
            labelProxyIcon->setToolTip(tr("Proxy is <b>enabled</b>: %1").arg(ip_port_q));
        } else {
            labelProxyIcon->show();
        }
    } else {
        labelProxyIcon->hide();
    }
}
void BitcoinGUI::showNormalIfMinimized(bool fToggleHidden)