Bug 166346 [Viewers] ViewerRow#getCell(Point) not working for Viewers without columns
If the viewer has no rows this should return not null but the ViewerCell at index 0
bundles/org.eclipse.jface/src/org/eclipse/jface/viewers/ViewerRow.java
import org.eclipse.swt.graphics.Color;
import org.eclipse.swt.graphics.Font;
import org.eclipse.swt.graphics.Image;
import org.eclipse.swt.graphics.Point;
import org.eclipse.swt.graphics.Rectangle;
import org.eclipse.swt.widgets.Control;
import org.eclipse.swt.widgets.Item;
/**
 * ViewerRow is the abstract superclass of the part that represents items in a
 * Table or Tree.
 * 
 * @since 3.3 <strong>EXPERIMENTAL</strong> This class or interface has been
 *        added as part of a work in progress. This API may change at any given
 *        time. Please do not use this API without consulting with the
 *        Platform/UI team.
 * 
 */
public abstract class ViewerRow {
	/**
	 * Key used to reference ViewerRow in the widgets data-map
	 */
	public static final String ROWPART_KEY = Policy.JFACE + ".ROWPART"; 
	/**
	 * Create a new instance of the receiver.
	 * 
	 * @param item
	 */
	ViewerRow(final Item item) {
		item.setData(ViewerRow.ROWPART_KEY, this);
		item.addDisposeListener(new DisposeListener() {