### Describe the issue
Warning messages are not displayed when running bitcoin-qt 0.14.2 and 0.14.99 with -disablewallet.
It might be better to always display them.

E.g. on MainNet the "This is a pre-release test build - use at your own risk - do not use for mining or merchant applications" is lost
![image](https://user-images.githubusercontent.com/3296421/29109760-853e5394-7ce4-11e7-8f05-bfcd66ada471.png)
![image](https://user-images.githubusercontent.com/3296421/29109806-adf6e67a-7ce4-11e7-8564-8883c44656ad.png)

On TestNet also the "Warning: unknown new rules activated (versionbit 28)" is missed
![image](https://user-images.githubusercontent.com/3296421/29110269-6b24b79e-7ce6-11e7-91e7-823227eaa200.png)
![image](https://user-images.githubusercontent.com/3296421/29110035-9142cf34-7ce5-11e7-8faf-264e805cdaf4.png)

{
    ui->labelSpendable->setVisible(showWatchOnly);      
    ui->labelWatchonly->setVisible(showWatchOnly);      
    ui->lineWatchBalance->setVisible(showWatchOnly);    
    ui->labelWatchAvailable->setVisible(showWatchOnly); 
    ui->labelWatchPending->setVisible(showWatchOnly);   
    ui->labelWatchTotal->setVisible(showWatchOnly);     
    if (!showWatchOnly)
        ui->labelWatchImmature->hide();
}
void OverviewPage::setClientModel(ClientModel *model)
{
    this->clientModel = model;
    if(model)
    {
        
        connect(model, &ClientModel::alertsChanged, this, &OverviewPage::updateAlerts);
        updateAlerts(model->getStatusBarWarnings());
    }
}
void OverviewPage::setWalletModel(WalletModel *model)