Bug 134266 [Wizard] Page description not set if page message already set
Since page messages such as errors and warnings used to be displayed in the same widget as the page description, code was put in place in WizardDialog#updateDescriptionMessage() to avoid setting the page description if there was already a message. As of 3.2 M6 there is a separate widget for displaying error and warning messages and so the page description should always be set.
bundles/org.eclipse.jface/src/org/eclipse/jface/wizard/WizardDialog.java
if (wizard.performFinish()) {
            
            
            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