Fix https://issues.apache.org/bugzilla/show_bug.cgi?id=54801
and
https://issues.apache.org/bugzilla/show_bug.cgi?id=54821
Don't try to parse EL expressions if EL is disabled or inside scriptlets for JSP documents.
Based on patches by kkolinko

git-svn-id: https://svn.apache.org/repos/asf/tomcat/tc7.0.x/trunk@1475755 13f79535-47bb-0310-9956-ffa450edef68