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.
setWindowIcon(networkStyle->getTrayAndWindowIcon());
    setWindowTitle(windowTitle);
    rpcConsole = new RPCConsole(node, _platformStyle, 0);
    helpMessageDialog = new HelpMessageDialog(node, this, false);
#ifdef ENABLE_WALLET
    if(enableWallet)
    {
        
        walletFrame = new WalletFrame(_platformStyle, this);
        setCentralWidget(walletFrame);
    } else
#endif 
    {
        /* When compiled without wallet or -disablewallet is provided,
         * the central widget is the rpc console.
         */
        setCentralWidget(rpcConsole);
    }
    
    setAcceptDrops(true);
    
    
    createActions();
    
    createMenuBar();
    
    createToolBars();
    
    if (QSystemTrayIcon::isSystemTrayAvailable()) {
        createTrayIcon(networkStyle);