Bug 149613 [regression]NPE when click TOC after click drill through link to pdf.
Description: NPE when click TOC after click drill through link to pdf. Steps to reproduce: 1. Insert a data item, define a drill through link to itself, target format is pdf. 2. Define toc for the data item 3. Preview in Web Viewer, click the drill through link. 4. Click TOC button in Web Viewer. Expected result: NO errors and show toc Actual result: java.lang.NullPointerException Stack Trace: org.eclipse.birt.report.service.BirtViewerReportService.getTOC(Unknown Source) org.eclipse.birt.report.service.actionhandler.AbstractGetTOCActionHandler.doExecution(Unknown Source) org.eclipse.birt.report.service.actionhandler.AbstractGetTOCActionHandler.__execute(Unknown Source) org.eclipse.birt.report.service.actionhandler.AbstractBaseActionHandler.execute(Unknown Source) org.eclipse.birt.report.soapengine.processor.AbstractBaseDocumentProcessor.__executeAction(Unknown Source) org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.executeAction(Unknown Source) org.eclipse.birt.report.soapengine.processor.BirtDocumentProcessor.handleGetToc(Unknown Source) sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:324) org.eclipse.birt.report.soapengine.processor.AbstractBaseComponentProcessor.process(Unknown Source) org.eclipse.birt.report.soapengine.endpoint.BirtSoapBindingImpl.getUpdatedObjects(Unknown Source) sun.reflect.GeneratedMethodAccessor51.invoke(Unknown Source) sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25) java.lang.reflect.Method.invoke(Method.java:324) org.apache.axis.providers.java.RPCProvider.invokeMethod(RPCProvider.java:397) org.apache.axis.providers.java.RPCProvider.processMessage(RPCProvider.java:186) org.apache.axis.providers.java.JavaProvider.invoke(JavaProvider.java:323) org.apache.axis.strategies.InvocationStrategy.visit(InvocationStrategy.java:32) org.apache.axis.SimpleChain.doVisiting(SimpleChain.java:118) org.apache.axis.SimpleChain.invoke(SimpleChain.java:83) org.apache.axis.handlers.soap.SOAPService.invoke(SOAPService.java:453) org.apache.axis.server.AxisServer.invoke(AxisServer.java:281) org.apache.axis.transport.http.AxisServlet.doPost(AxisServlet.java:699) org.eclipse.birt.report.servlet.BirtSoapMessageDispatcherServlet.doPost(Unknown Source) javax.servlet.http.HttpServlet.service(HttpServlet.java:760) org.apache.axis.transport.http.AxisServletBase.service(AxisServletBase.java:327) javax.servlet.http.HttpServlet.service(HttpServlet.java:853) org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:247) org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:193) org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:256) org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) org.apache.catalina.valves.CertificatesValve.invoke(CertificatesValve.java:246) org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.java:480) org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:995) org.apache.catalina.core.StandardContext.invoke(StandardContext.java:2422) org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:180) org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:643) org.apache.catalina.valves.ErrorDispatcherValve.invoke(ErrorDispatcherValve.java:171) org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.invokeNext(StandardPipeline.java:641) org.eclipse.tomcat.internal.EclipseErrorReportValve.invoke(EclipseErrorReportValve.java:153) org.apache.catalina.core.StandardPipeline$StandardPipelineValveContext.i
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/service/ViewerHTMLActionHandler.java
{
	/**
	 * Logger for this handler.
	 */
	protected Logger log = Logger.getLogger( ViewerHTMLActionHandler.class
			.getName( ) );
	/**
	 * Document instance.
	 */
	protected IReportDocument document = null;
	/**
	 * Locale of the requester.
	 */
	protected Locale locale = null;
	/**
	 * Page number of the action requester.
	 */
	protected long page = -1;
	/**