Bug 15844 [Exception Handling] SelectionChange events and NPE
Build 20020508 Due to new global actions there are now more objects listening to selection changes send out by a JFace viewer. We now had the case that one of the listener generated a NPE. As a result all listeners registered after that one didn't receive the selection change event. StructuredViewers should be more fault tolorant to exceptions when informing listeners.
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/CheckboxTableViewer.java
* List of check state listeners (element type: <code>ICheckStateListener</code>).
	 */
	private ListenerList checkStateListeners = new ListenerList(3);
/**
 * Creates a table viewer on a newly-created table control under the given parent.
 * The table control is created using the SWT style bits: 
 * <code>SWT.CHECK</code> and <code>SWT.BORDER</code>.
 * The table has one column.
 * The viewer has no input, no content provider, a default label provider, 
 * no sorter, and no filters.
 * <p>
 * This is equivalent to calling <code>new CheckboxTableViewer(parent, SWT.BORDER)</code>.
 * See that constructor for more details.
 * </p>
 *
 * @param parent the parent control
 * 
 * @deprecated use newCheckList(Composite, int) or new CheckboxTableViewer(Table)
 *   instead (see below for details)
 */
public CheckboxTableViewer(Composite parent) {
	this(parent, SWT.BORDER);
}
/**
 * Creates a table viewer on a newly-created table control under the given parent.
 * The table control is created using the given SWT style bits, plus the 
 * <code>SWT.CHECK</code> style bit.
 * The table has one column. 
 * The viewer has no input, no content provider, a default label provider, 
 * no sorter, and no filters.