Bug 203709 NullPointerException in TableAreaLayout
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/cache/TableAreaLayout.java
dummyCell = new DummyCell(lastCell);
						if(lastCell.getRowSpan()>0)
						{
							dummyCell.setRowSpan( lastCell.getRowSpan( )-1 );
						}
						else
						{
							dummyCell.setRowSpan( lastCell.getRowSpan( ) );
						}
						dummyCell.setHeight( lastCell.getHeight( ) - lastRow.getArea( ).getHeight( ) - rowHeight);
					}
					row.addArea( dummyCell );
					
					if(dummyCell.getRowSpan( )==1)
					{
						if(dummyCell.getHeight( )<0)
						{
							CellArea cArea = dummyCell.getCell( );
							if(!dropCells.contains( cArea ))
							{
								cArea.setHeight( cArea.getHeight( ) - dummyCell.getHeight( ) );
								verticalAlign( cArea );
								dropCells.add( cArea );
							}
						}
					}
					else
					{
						hasDropCell = true;
					}