Test for upload a attach file which is named by Chinese(maybe GB2312)

The Result is:
Case 1: By Firefox,no problem.
Case 2: By IE, big Problem:

type Exception report

message 

description The server encountered an internal error () that prevented it from fulfilling this request.

exception 

javax.servlet.ServletException: getCacheEntry called with an empty ornull key
	com.ecyrd.jspwiki.dav.WebdavServlet.service(WebdavServlet.java:157)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


root cause 

java.lang.IllegalArgumentException: getCacheEntry called with an empty ornull key
	com.opensymphony.module.oscache.base.Cache.getCacheEntry(Cache.java:373)
	com.opensymphony.module.oscache.base.Cache.flushEntry(Cache.java:523)
	com.ecyrd.jspwiki.providers.CachingAttachmentProvider.putAttachmentData(CachingAttachmentProvider.java:127)
	com.ecyrd.jspwiki.attachment.AttachmentManager.storeAttachment(AttachmentManager.java:374)
	com.ecyrd.jspwiki.attachment.AttachmentServlet.upload(AttachmentServlet.java:450)
	com.ecyrd.jspwiki.attachment.AttachmentServlet.doPost(AttachmentServlet.java:302)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:709)
	com.ecyrd.jspwiki.dav.WebdavServlet.service(WebdavServlet.java:150)
	javax.servlet.http.HttpServlet.service(HttpServlet.java:802)


note The full stack trace of the root cause is available in the Apache Tomcat/5.5.7 logs.