Bug 126839 [DataBinding] IObservable refactoring
bundles/org.eclipse.jface.databinding/src/org/eclipse/jface/internal/databinding/TableBinding.java
context.updatePartialValidationError(targetChangeListener, null);
		context.updateValidationError(targetChangeListener, validationError);
		return validationError;
	}
	
	private boolean failure(String errorMessage) {
		if (errorMessage != null) {
			return true;
		}
		return false;
	}
	/* (non-Javadoc)
	 * @see org.eclipse.jface.internal.databinding.Binding#updateTargetFromModel(org.eclipse.jface.internal.provisional.databinding.ChangeEvent)
	 */
	public void updateTargetFromModel(ChangeEvent changeEvent) {
		target.clear();
		target.addAll(modelSet.toCollection());
		target.setCellProvider(new ICellProvider() {
			public Object getCellValue(Object element, int index) {
				
				Object cellValue = model.getCellValue(element,index);
				return cellValue == null ? "" : cellValue; 
			}
			public void setCellValue(Object element, int index, Object value) {
				
				model.setCellValue(element,index,value);
			}});
	}
}