Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54981
Merged revision 1483229 from tomcat/trunk:
ServletContext.getJspConfigDescriptor() must return NULL when there is no jsp configuration


git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1483385 13f79535-47bb-0310-9956-ffa450edef68