Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=55454
Merged revision 1515841 from tomcat/trunk:
Fixed NPE thrown when parsing an invalid content type.

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1515862 13f79535-47bb-0310-9956-ffa450edef68