Bug 204245 Blank column on visibility column in excel[0300]
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/executor/buffermgr/TableContentLayout.java
assert ( columnNumber + columnSpan <= realColCount );
		ensureSize( rowCount, columnNumber + columnSpan );
		
		Cell cell = rows[rowCount - 1].cells[columnNumber];
		int status = cell.getStatus( );
		if ( status == Cell.CELL_EMPTY )
		{
			Cell newCell = Cell.createCell( rows[rowCount - 1].rowId,
					columnNumber, rowSpan, columnSpan, content );
			Cell[] cells = rows[rowCount - 1].cells;
			rows[rowCount - 1].cells[columnNumber] = newCell;
			for ( int i = columnNumber + 1; i < columnNumber + columnSpan; i++ )
			{
				cells[i] = Cell.createSpanCell( rows[rowCount - 1].rowId, i,
						newCell );
			}
		}
		else
		{
			
		}
	}
	
	
	public void resolveDropCells( boolean finished )
	{
		if(!finished)
		{
			keepUnresolvedCells( );
		}