Bug 54821

I noted this issue while reviewing code for bug 54801.
Reproducible with current 7.0 = 7.0.39.

Steps to reproduce:
1. Put the attached "page3.jspx" and "page4.jspx" files into examples webapp.

Page 3:
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.0">
<jsp:directive.page isELIgnored="true"/>
${Hello, world!!}
</jsp:root>

Page 4:
<jsp:root xmlns:jsp="http://java.sun.com/JSP/Page" version="2.0">
<jsp:directive.page isELIgnored="true"/>
${Hello, world!!
</jsp:root>

2. Start Tomcat
3. Access http://localhost:8080/examples/page3.jspx
This works as expected and prints "${Hello, world!!}"

4. Access http://localhost:8080/examples/page4.jspx
This fails with error 500,

org.apache.jasper.JasperException: /page4.jspx (line: 21, column: 12) Unterminated ${ tag

* root cause *:
org.xml.sax.SAXParseException: Unterminated ${ tag
org.apache.jasper.compiler.JspDocumentParser.processChars(JspDocumentParser.java:538)
org.apache.jasper.compiler.JspDocumentParser.endElement(JspDocumentParser.java:610)
com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.endElement(AbstractSAXParser.java:601)