Bug 183732 [DataBinding] swallowing the exception in get/set value of the JavaBeanObservableValue
During the bidning of beans that have PropertyChangeSupport implemented but not properly initialized (i.e null), data binding "swallows" the NullPointerException only logging "Could not attach listener to".
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/core/tests/internal/databinding/internal/beans/JavaBeanObservableValueTest.java
private Bean bean;
	private JavaBeanObservableValue observableValue;
	private PropertyDescriptor propertyDescriptor;
	private String propertyName;
	
	/* (non-Javadoc)
	 * @see junit.framework.TestCase#setUp()
	 */
	protected void setUp() throws Exception {
		super.setUp();
		
		bean = new Bean();
		propertyName = "value";
		propertyDescriptor = new PropertyDescriptor(propertyName, Bean.class);
		observableValue = new JavaBeanObservableValue(Realm.getDefault(), bean, propertyDescriptor, String.class);
	}
	
    public void testSetsValueInBean() throws Exception {
        String value = "value";
        assertNull(observableValue.getValue());
        observableValue.setValue(value);
        assertEquals("value", value, observableValue.getValue());
    }
    
    public void testGetObserved() throws Exception {
    	assertEquals(bean, observableValue.getObserved());
	}