Bug 203709 NullPointerException in TableAreaLayout
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/cache/TableAreaLayout.java
areaStyle.setProperty( IStyle.STYLE_PADDING_TOP, IStyle.NUMBER_0 );
					areaStyle.setProperty( IStyle.STYLE_MARGIN_TOP, IStyle.NUMBER_0 );
					emptyCell.setWidth( getCellWidth( startColumn, endColumn ) );
					emptyCell.setPosition( layoutInfo.getXPosition( i ), 0 );
					rowArea.addChild( emptyCell );
					i = i + emptyCell.getColSpan( ) -1;
				}
			}
		}
		if ( specifiedHeight == 0 && isEmptyRow( row ) )
		{
			height = Math.max( height, getHeightOfEmptyRow( row ));
		}
		
		
		if(height >= 0)
		{
			Iterator iter = rowArea.getChildren( );
			while(iter.hasNext( ))
			{
				CellArea cell = (CellArea)iter.next( );
				if(cell.getRowSpan( )==1)
				{
					cell.setHeight( height );
					verticalAlign( cell );
				}
			}
			rowArea.setHeight( height );
		}