<!-- Describe the issue -->
Hello evryone, I get nothing when I click in open wallet, I am new to bitcoin and expect to show something.

![BitcoinIssue](https://user-images.githubusercontent.com/39341595/57179721-5024fc00-6e9e-11e9-80dd-af5e4345be48.png)

I'am using Bitcoin Core (both in testnet and mainnet, didn't work) 0.18 on window 10. 

#elif defined(Q_OS_WIN)
        "windows"
#else
        "other"
#endif
        ;
BitcoinGUI::BitcoinGUI(interfaces::Node& node, const PlatformStyle *_platformStyle, const NetworkStyle *networkStyle, QWidget *parent) :
    QMainWindow(parent),
    m_node(node),
    trayIconMenu{new QMenu()},
    platformStyle(_platformStyle),
    m_network_style(networkStyle)
{
    QSettings settings;
    if (!restoreGeometry(settings.value("MainWindowGeometry").toByteArray())) {
        
        move(QApplication::desktop()->availableGeometry().center() - frameGeometry().center());
    }
#ifdef ENABLE_WALLET
    enableWallet = WalletModel::isWalletEnabled();
#endif 
    QApplication::setWindowIcon(m_network_style->getTrayAndWindowIcon());
    setWindowIcon(m_network_style->getTrayAndWindowIcon());
    updateWindowTitle();
    rpcConsole = new RPCConsole(node, _platformStyle, nullptr);
    helpMessageDialog = new HelpMessageDialog(node, this, false);
#ifdef ENABLE_WALLET
    if(enableWallet)
    {