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
getShell().setBounds(getConstrainedShellBounds(size));
    }
    /**
     * Computes the correct dialog size for the current page and resizes 
     * its shell if nessessary. Also causes the container to refresh its
     * layout.
     * 
     * @param page the wizard page to use to resize the dialog
     * @since 2.0
     */
    protected void updateSize(IWizardPage page) {
        if (page == null || page.getControl() == null) {
			return;
		}
        updateSizeForPage(page);
        pageContainerLayout.layoutPage(page.getControl());
    }
    /* (non-Javadoc)
     * @see org.eclipse.jface.wizard.IWizardContainer2#updateSize()
     */
    public void updateSize() {
        updateSize(currentPage);
    }
    /**
     * Computes the correct dialog size for the given page and resizes 
     * its shell if nessessary.
     *
     * @param page the wizard page
     */
    private void updateSizeForPage(IWizardPage page) {