Bug 114542 [Markers] Possible to get empty path nodes in problems view hierarcahl mode
20051101 Warnings on the top level of a project ended up having an empty label. STEPS 1) Change filters to show selected elements and children 2) Go into hierarchal mode 3) Select org.eclipse.ui.tests
bundles/org.eclipse.ui.ide/src/org/eclipse/ui/views/markers/internal/MarkerView.java
* By default, this method calls
	 * <code>updateStatusMessage(IStructuredSelection)</code> with the current
	 * selection or <code>null</code>. Classes wishing to override this
	 * functionality, should just override the method
	 * <code>updateStatusMessage(IStructuredSelection)</code>.
	 * </p>
	 */
	protected void updateStatusMessage() {
		ISelection selection = getViewer().getSelection();
		if (selection instanceof IStructuredSelection)
			updateStatusMessage((IStructuredSelection) selection);
		else
			updateStatusMessage(null);
	}
	/**
	 * Updates that message displayed in the status line. If the selection
	 * parameter is <code>null</code> or its size is 0, the status area is
	 * blanked out. If only 1 marker is selected, the status area is updated
	 * with the contents of the message attribute of this marker. In other cases
	 * (more than one marker is selected) the status area indicates how many
	 * items have been selected.
	 * <p>
	 * This method may be overwritten.
	 * </p>
	 * <p>
	 * This method is called whenever a selection changes in this view.
	 * </p>
	 * 
	 * @param selection
	 *            a valid selection or <code>null</code>