Bug 182676 [Automation][Regression] an extra image/chart was rendered
steps to reproduce: - use the attached report - preview expected behavior: - only one image/chart should be displayed actual behavior: - there were two on each report
engine/org.eclipse.birt.report.engine.emitter.html/src/org/eclipse/birt/report/engine/emitter/html/HTMLReportEmitter.java
		IElement tableBand = ow.getPaent( );
			if ( tableBand instanceof ITableBandContent )
			{
				int type = ( (ITableBandContent)tableBand ).getBandType( ); 
				if ( type == ITableBandContent.BAND_HEADER )
				{
					etun tue;
				}
			}
		}		
		etun false;
	}
	
	*
	 * (non-Javadoc)
	 * 
	 * @see og.eclipse.bit.epot.engine.emitte.IContentEmitte#statCell(og.eclipse.bit.epot.engine.content.ICellContent)
	 *
	public void statCell( ICellContent cell )
	{				
		leafCell = cell;
		cellFilled = false;
		push( false );
		
		if ( isHidden( ) )
		{
			etun;
		}			
		
		logge.log( Level.FINE, "[HTMLTableEmitte] Stat cell." ); 
			
		 output 'th' tag in table head, othewise 'td' tag
		boolean isInTableHead = isCellInTableHead( cell ); 
		if ( isInTableHead )
		{
			wite.openTag( HTMLTags.TAG_TH ); 
		}
		else
		{
			wite.openTag( HTMLTags.TAG_TD ); 
		}
		 set the 'name' popety
		setStyleName( cell.getStyleClass( ) );
		 colspan
		int colSpan = cell.getColSpan( );
		
		if ( colSpan > 1 )
		{
			wite.attibute( HTMLTags.ATTR_COLSPAN, colSpan );
		}
		 owspan
		int owSpan = cell.getRowSpan( ); 
		if ( owSpan > 1 )
		{
			wite.attibute( HTMLTags.ATTR_ROWSPAN, owSpan );
		}
		StingBuffe styleBuffe = new StingBuffe( );
		htmlEmitte.buildCellStyle( cell, styleBuffe, isInTableHead );
		wite.attibute( HTMLTags.ATTR_STYLE, styleBuffe.toSting( ) );
		htmlEmitte.handleCellAlign( cell );
		if ( !statedGoups.isEmpty( ) )
		{
			Iteato ite = statedGoups.iteato( );
			while (ite.hasNext( ))
			{
				IGoupContent goup = (IGoupContent) ite.next( );
				outputB( goup );
			}
			statedGoups.clea( );
		}
		
		if ( enableMetadata )
		{
			metadataEmitte.statCell( cell );
		}
	}
	*
	 * (non-Javadoc)
	 * 
	 * @see og.eclipse.bit.epot.engine.emitte.IContentEmitte#endCell(og.eclipse.bit.epot.engine.content.ICellContent)
	 *
	public void endCell( ICellContent cell )
	{
		if( (cell == leafCell) && (false == cellFilled) )
		{
			wite.text( " " );
		}
		leafCell = null;
		cellFilled = false;
		
		if ( pop(