Bug 144577 Print in Web Viewer doesn't work in Linux
Description: Print in Web Viewer doesn't work in Linux Steps to reproduce: 1. New a report 2. Preview in Web Viewer and click Print button Expected result: Page is printed Actual result: Nothing happened.
viewer/org.eclipse.birt.report.viewer/birt/WEB-INF/classes/org/eclipse/birt/report/utility/BirtUtility.java
* 
	 * @param request
	 */
	public static void removeTask( HttpServletRequest request )
	{
		if ( request == null )
			return;
		try
		{
			
			BaseAttributeBean attrBean = (BaseAttributeBean) request
					.getAttribute( IBirtConstants.ATTRIBUTE_BEAN );
			if ( attrBean == null )
				return;
			String taskid = attrBean.getTaskId( );
			if ( taskid == null )
				return;
			
			HttpSession session = request.getSession( true );
			Map map = (Map) session.getAttribute( IBirtConstants.TASK_MAP );
			if ( map == null )
				return;
			
			synchronized ( map )
			{
				map.remove( taskid );
			}
		}
		catch ( Exception e )
		{