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
* @return the update summary
	 */
	protected String updateSummaryVisible() {
		return ""; 
	}
	/**
	 * Open a dialog on the filters
	 * 
	 */
	public final void openFiltersDialog() {
		DialogMarkerFilter dialog = createFiltersDialog();
		if (dialog.open() == Window.OK) {
			MarkerFilter[] result = dialog.getFilters();
			if (result == null)
				return;
			if (result.length == 0)
				setFilters(new MarkerFilter[] { createFilter(MarkerMessages.MarkerFilter_defaultFilterName) });
			else
				setFilters(result);
			updateForFilterChanges();
			refreshFilterMenu();
			getViewer().refresh();
		}
	}
	/**
	 * Set the filters to newFilters.
	 * 
	 * @param newFilters
	 */
	void setFilters(MarkerFilter[] newFilters) {