Bug 277966 [Databinding] regression: ObservablesManager throws NPE on dispose if one of the observables is already disposed
tests/org.eclipse.jface.tests.databinding/src/org/eclipse/core/tests/databinding/ObservablesManagerTest.java
}
		/*
		 * (non-Javadoc)
		 *
		 * @see org.eclipse.core.databinding.observable.IObservable#addStaleListener(org.eclipse.core.databinding.observable.IStaleListener)
		 */
		public void addStaleListener(IStaleListener listener) {
			
		}
		public boolean isDisposed() {
			return disposeCalled;
		}
		/*
		 * (non-Javadoc)
		 *
		 * @see org.eclipse.core.databinding.observable.IObservable#dispose()
		 */
		public void dispose() {
			disposeCalled = true;
		}
		/*
		 * (non-Javadoc)
		 *
		 * @see org.eclipse.core.databinding.observable.IObservable#getRealm()
		 */
		public Realm getRealm() {
			return Realm.getDefault();
		}
		/*
		 * (non-Javadoc)