NullPointerException when edit a project group with empty or only whitespaces values in Project Group Name

2009-03-21 17:39:58.270::WARN:  /saveProjectGroup.action: java.io.IOException: Stream closed
2009-03-21 17:39:58.270::WARN:  EXCEPTION 
org.apache.jasper.JasperException: java.lang.NullPointerException
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:402)
	at org.apache.jasper.servlet.JspServlet.serviceJspFile(JspServlet.java:470)
	at org.apache.jasper.servlet.JspServlet.service(JspServlet.java:364)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.mortbay.jetty.servlet.ServletHolder.handle(ServletHolder.java:487)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:362)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
	at org.mortbay.jetty.servlet.Dispatcher.forward(Dispatcher.java:285)
	at org.mortbay.jetty.servlet.Dispatcher.error(Dispatcher.java:135)
	at org.mortbay.jetty.servlet.ErrorPageErrorHandler.handle(ErrorPageErrorHandler.java:121)
	at org.mortbay.jetty.Response.sendError(Response.java:274)
	at org.mortbay.jetty.servlet.ServletHandler.handle(ServletHandler.java:433)
	at org.mortbay.jetty.security.SecurityHandler.handle(SecurityHandler.java:216)
	at org.mortbay.jetty.servlet.SessionHandler.handle(SessionHandler.java:181)
	at org.mortbay.jetty.handler.ContextHandler.handle(ContextHandler.java:729)
	at org.mortbay.jetty.webapp.WebAppContext.handle(WebAppContext.java:405)
	at org.mortbay.jetty.handler.ContextHandlerCollection.handle(ContextHandlerCollection.java:206)
	at org.mortbay.jetty.handler.HandlerCollection.handle(HandlerCollection.java:114)
	at org.mortbay.jetty.handler.HandlerWrapper.handle(HandlerWrapper.java:152)
	at org.mortbay.jetty.Server.handle(Server.java:324)
	at org.mortbay.jetty.HttpConnection.handleRequest(HttpConnection.java:505)
	at org.mortbay.jetty.HttpConnection$RequestHandler.content(HttpConnection.java:843)
	at org.mortbay.jetty.HttpParser.parseNext(HttpParser.java:647)
	at org.mortbay.jetty.HttpParser.parseAvailable(HttpParser.java:211)
	at org.mortbay.jetty.HttpConnection.handle(HttpConnection.java:380)
	at org.mortbay.io.nio.SelectChannelEndPoint.run(SelectChannelEndPoint.java:395)
	at org.mortbay.thread.QueuedThreadPool$PoolThread.run(QueuedThreadPool.java:488)
Caused by: java.lang.NullPointerException
	at org.apache.struts2.views.jsp.ComponentTagSupport.doStartTag(ComponentTagSupport.java:50)
	at org.apache.jsp.WEB_002dINF.jsp.error.httpError_jsp._jspx_meth_s_i18n_0(org.apache.jsp.WEB_002dINF.jsp.error.httpError_jsp:103)
	at org.apache.jsp.WEB_002dINF.jsp.error.httpError_jsp._jspService(org.apache.jsp.WEB_002dINF.jsp.error.httpError_jsp:80)
	at org.apache.jasper.runtime.HttpJspBase.service(HttpJspBase.java:93)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:820)
	at org.apache.jasper.servlet.JspServletWrapper.service(JspServletWrapper.java:373)
	... 29 more