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
public abstract void setForeground(int columnIndex, Color color);
	/**
	 * Get the font at the columnIndex.
	 * 
	 * @param columnIndex
	 * @return {@link Font} or <code>null</code>
	 */
	public abstract Font getFont(int columnIndex);
	/**
	 * Set the {@link Font} at the columnIndex.
	 * 
	 * @param columnIndex
	 * @param font
	 */
	public abstract void setFont(int columnIndex, Font font);
	/**
	 * Get the ViewerCell at point.
	 * 
	 * @param point
	 * @return {@link ViewerCell}
	 */
	public ViewerCell getCell(Point point) {
		int index = getColumnIndex(point);
		return getCell(index);
	}
	/**
	 * Get the columnIndex of the point.
	 * 
	 * @param point
	 * @return int or -1 if it cannot be found.