Bug 203709 NullPointerException in TableAreaLayout
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/cache/TableAreaLayout.java
protected int getRowSpan(IRowContent row, CellArea cell, RowArea rowArea)
	{
		int rowSpan = cell.getRowSpan();
		IContent rowContent = rowArea.getContent();
		
		if ( rowSpan > 1
				&& ( !row.getInstanceID( ).toUniqueString( ).equals(
						rowContent.getInstanceID( ).toUniqueString( ) ) ) )
		{
			return rowSpan - 1;
		}
		return rowSpan;
	}
	
	protected CellArea getReference()
	{
		return null;
	}
	
	public int getCellWidth( int startColumn, int endColumn )
	{
		if ( layoutInfo != null )
		{
			return layoutInfo.getCellWidth( startColumn, endColumn );
		}
		return 0;
	}
	
	private static class UnresolvedRow