Bug 155496 Due to inactivity, a group report gives NULL Pointer Exception on selection of TOC and Export CSV option
Steps to reproduce this issue:- 1. Access any Group report that lists groups in TOC 2. For some time do not do any activity on report page (say 15 mins.) 3. Now click on Toggle Table Contents Link 4. The pop window gets opened with following error message java.lang.NullPointerException 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.GeneratedMethodAccessor80.invoke(Unknown Source) When page remains idle for some time the same error gets displayed on selection of Export CSV option. Note:- This issue occurs for the reports that are run using '__overwrite' option. Any help on this is highly appreciated.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/ParameterAccessor.java
*/
	public static boolean isGetImageOperator( HttpServletRequest request )
	{
		String imageName = getParameter( request, PARAM_IMAGEID );
		return imageName != null && imageName.length( ) > 0;
	}
	/**
	 * Check whether the request is to get reportlet.
	 * 
	 * @param request
	 *            http request
	 * @return is get reportlet or not
	 */
	public static boolean isGetReportlet( HttpServletRequest request )
	{
		return isBookmarkReportlet( request ) || isIidReportlet( request );
	}
	/**
	 * if the PARAM_ISREPORTLET is trure and the PARAM_BOOKMARK is not null,
	 * this method will return true. Otherwise, return false.
	 * 
	 * @param request
	 * @return true for render the reportlet based on bookmark, else, false.
	 */
	public static boolean isBookmarkReportlet( HttpServletRequest request )
	{
		if ( "true"
				.equalsIgnoreCase( getParameter( request, PARAM_ISREPORTLET ) ) )
		{
			String bookmark = getParameter( request, PARAM_BOOKMARK );