Bug 141951 Export data throw NPE when target document doesn't exist
Description: Export data doesn't work when deploy birt in WebSphere6 Steps to reproduce: 1. Deploy birt in WebSphere6 2. Preview report and click Export Data Result: java.lang.NullPointerException Stack Trace: org.apache.axis.AxisFault.makeFault(AxisFault.java:101) org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.process(Unknown Source) org.eclipse.birt.report.soapengine.endpoint.BirtSoapBindingImpl.getUpdatedObjects(Unknown Source) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/BirtViewerReportService.java
IViewerReportDesignHandle design, InputOptions runOptions,
			String paramName ) throws ReportServiceException
	{
		IGetParameterDefinitionTask task = getParameterDefinitionTask( design );
		Collection selectionList = task.getSelectionList( paramName );
		return convertEngineParameterSelectionChoice( selectionList );
	}
	private IGetParameterDefinitionTask getParameterDefinitionTask(
			IViewerReportDesignHandle design ) throws ReportServiceException
	{
		IGetParameterDefinitionTask task;
		if ( design.getContentType( ) == IViewerReportDesignHandle.RPT_RUNNABLE_OBJECT )
		{
			
			IReportRunnable runnable = (IReportRunnable) design
					.getDesignObject( );
			task = ReportEngineService.getInstance( )
					.createGetParameterDefinitionTask( runnable );
		}
		else
		{
			
			try
			{
				task = getParameterDefinitionTask( design.getFileName( ) );
			}
			catch ( EngineException e )
			{
				throw new ReportServiceException( e.getLocalizedMessage( ) );
			}