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
else if ( command == COMMAND_EDIT_FILTER )
		{
			return invokeEditFilter( );
		}
		else if ( command == COMMAND_EDIT_PARAMETER )
		{
			return invokeEditParameter( );
		}
		else if ( command == COMMAND_EDIT_BINDING )
		{
			return invokeDataBinding( );
		}
		return Window.CANCEL;
	}
	protected int invokeNewDataSet( )
	{
		List dataSources = getReportDesignHandle( ).getVisibleDataSources( );
		if ( dataSources.isEmpty( ) )
		{
			
			new NewDataSourceAction( ).run( );
		}
		IAction action = new NewDataSetAction( );
		PlatformUI.getWorkbench( ).getHelpSystem( ).setHelp( action,
				ChartHelpContextIds.DIALOG_NEW_DATA_SET );
		action.run( );
		return Window.OK;
	}
	protected int invokeEditFilter( )
	{