Bug 176457 Use container's column bindings in chart editor
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/ReportDataServiceProvider.java
if ( list.size( ) > 0 )
		{
			return ( (DataSetHandle) list.get( 0 ) ).getQualifiedName( );
		}
		return null;
	}
	public void setContext( Object context )
	{
		itemHandle = (ExtendedItemHandle) context;
	}
	public void setDataSet( String datasetName )
	{
		boolean needClean = true;
		try
		{
			if ( datasetName == null )
			{
				
				
				if ( getBoundDataSet( ) == null
						&& ( getReportDataSet( ) == null || itemHandle.columnBindingsIterator( )
								.hasNext( ) ) )
				{
					needClean = false;
				}
				else
				{
					itemHandle.setDataSet( null );
				}
			}