Bug 199714 NPE with invalid url[0002]
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/BirtViewerReportService.java
Collection selectionList = task.getSelectionList( paramName );
				return convertEngineParameterSelectionChoice( selectionList );
			}
		}
		finally
		{
			if ( task != null )
				task.close( );
		}
		return null;
	}
	/**
	 * Returns the GetParameterDefinitionTask
	 * 
	 * @param design
	 * @param options
	 * @return
	 * @throws ReportServiceException
	 */
	private IGetParameterDefinitionTask getParameterDefinitionTask(
			IViewerReportDesignHandle design, InputOptions options )
			throws ReportServiceException
	{
		IGetParameterDefinitionTask task;
		if ( design.getContentType( ) == IViewerReportDesignHandle.RPT_RUNNABLE_OBJECT )
		{
			
			IReportRunnable runnable = (IReportRunnable) design
					.getDesignObject( );
			task = ReportEngineService.getInstance( )