Bug 199179 [DataBinding] WizardPageSupport does not report exceptions thrown in bindings
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/databinding/wizard/WizardPageSupport.java
int type;
			switch (severity) {
			case IStatus.OK:
				type = IMessageProvider.NONE;
				break;
			case IStatus.CANCEL:
				type = IMessageProvider.NONE;
				break;
			case IStatus.INFO:
				type = IMessageProvider.INFORMATION;
				break;
			case IStatus.WARNING:
				type = IMessageProvider.WARNING;
				break;
			case IStatus.ERROR:
				type = IMessageProvider.ERROR;
				break;
			default:
				throw new AssertionFailedException(
						"incomplete switch statement"); 
			}
			wizardPage.setErrorMessage(null);
			wizardPage.setMessage(currentStatus.getMessage(), type);
		} else {
			wizardPage.setPageComplete(true);
			wizardPage.setMessage(null);
			wizardPage.setErrorMessage(null);
		}
	}
	/**