Bug 112287 It's better to transfer to "new data source" dialog when creating a new data set without existing data source.
Description: It's better to transfer to "new data source" dialog automatically when creating a new data set without existing data source. Steps to reproduce: 1. There is no existing data source. 2. Create a new data set. 3. It pops up hint message, saying that "there is no data source". Actual result: it's better to transfer to "new data source" dialog box now and help users create a new data source.
chart/org.eclipse.birt.chart.reportitem.ui/src/org/eclipse/birt/chart/reportitem/ui/ReportDataServiceProvider.java
}
			return columnList;
		}
		return Collections.EMPTY_LIST;
	}
	/**
	 * Gets dataset from ReportItemHandle at first. If null, get dataset from
	 * its container.
	 * 
	 * @return direct dataset
	 */
	protected DataSetHandle getDataSetFromHandle( )
	{
		if ( itemHandle.getDataSet( ) != null )
		{
			return itemHandle.getDataSet( );
		}
		List datasetList = DEUtil.getDataSetList( itemHandle.getContainer( ) );
		if ( datasetList.size( ) > 0 )
		{
			return (DataSetHandle) datasetList.get( 0 );
		}
		return null;
	}
	public int invoke( int command )
	{
		if ( command == COMMAND_NEW_DATASET )
		{
			return invokeNewDataSet( );
		}