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
* @param text
	 */
	public abstract void setText(int columnIndex, String text);
	/**
	 * Get the background at the columnIndex,
	 * 
	 * @param columnIndex
	 * @return {@link Color} or <code>null</code>
	 */
	public abstract Color getBackground(int columnIndex);
	/**
	 * Set the background at the columnIndex.
	 * 
	 * @param columnIndex
	 * @param color
	 */
	public abstract void setBackground(int columnIndex, Color color);
	/**
	 * Get the foreground at the columnIndex.
	 * 
	 * @param columnIndex
	 * @return {@link Color} or <code>null</code>
	 */
	public abstract Color getForeground(int columnIndex);
	/**
	 * Set the foreground at the columnIndex.
	 * 
	 * @param columnIndex
	 * @param color
	 */