Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=56529
Merged revision 1595171 from tomcat/trunk:
Fixed NoSuchElementException while handling attributes with empty string value in custom tags. Patch provided by Hariprasad Manchi.


git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1595174 13f79535-47bb-0310-9956-ffa450edef68