Bug 182190 [StatusHandling] [Wizards] getControl assert on wizard page has no message
M6 If you forget to set the control on your wizard page our assert gives no feedback. We need an error message.
bundles/org.eclipse.jface/src/org/eclipse/jface/wizard/WizardDialog.java
for (int i = 0; i < nestedWizards.size() - 1; i++) {
                ((IWizard) nestedWizards.get(i)).performFinish();
            }
             
            setReturnCode(OK);
            hardClose();
        }
    }
    /* (non-Javadoc)
     * Method declared on IWizardContainer.
     */
    public IWizardPage getCurrentPage() {
        return currentPage;
    }
    /**
     * Returns the progress monitor for this wizard dialog (if it has one).
     *
     * @return the progress monitor, or <code>null</code> if
     *   this wizard dialog does not have one
     */
    protected IProgressMonitor getProgressMonitor() {
        return progressMonitorPart;
    }
    /**
     * Returns the wizard this dialog is currently displaying.
     *
     * @return the current wizard
     */
    protected IWizard getWizard() {
        return wizard;